The computer turns on but the screen does not light up. Laptop won't turn on - black screen. What is the reason and how to eliminate it? Incorrect connection or faulty cable

Today, most people use a computer for both work and leisure. But, like any other type of equipment, a PC can fail. Most often, the failure is only partial and affects only one of the devices. One of the most popular situations is when the monitor is silent when you turn on the computer. This problem is often discussed on computer forums. The first thing you need to understand is that either the monitor itself is broken, or the system unit may be the cause of the malfunction.

The block consists of many devices that are responsible for displaying the image on the monitor. And when a breakdown occurs with these components, the image quality will deteriorate or will not be displayed on the monitor at all. The user in such a situation will immediately think that the problem is in the screen, and perhaps even buy a new one, and this will be a waste of money. First you need to figure out the reason for the loss of the image, find out why the screen is not showing, and only then take action. Most of these problems can be solved with your own hands and even without specific knowledge.

The most common reasons why the monitor does not turn on are:

Lack of electrical power;
Problems with the connecting cord;
Incorrect image settings;
Problems with video adapter drivers;
Video card failure;
Motherboard malfunction;
Unstable operation of the operating system;
Incorrect BIOS settings;
Monitor failure;

Despite its simplicity, this is a very common problem. An unconnected cable may not be noticed, especially if a person is in a hurry and panicking. You can also accidentally touch the plug and disconnect the cord from the outlet or monitor. Children and even pets can do this.

Such a funny problem is very easy to solve and identify. If the power is connected, you can see a glowing indicator of a certain color on the monitor (depending on the type of screen). If it does not light up, then check the connection. You need to remove the plug from the socket, see if there is any dust or other debris on it, and insert it back. The same manipulation must be performed with the cord on the side connecting to the display.

If the indicator starts to light up and the screen works, then the problem is solved and you can start using the computer with relief. If the light appears, but the screen does not turn on, or even the light does not appear, then the problem is different, and it is worth looking for its cause further.

Incorrect connection or faulty cable

You need to check whether the cable is connected to exactly the input that is required. This is true if you have an integrated and floppy video card. The monitor, in this case, is connected to a discrete one, the connector of which is located below.

You also need to check whether the cable is inserted correctly, both into the monitor and into the system unit. It needs to be removed and inserted back with the correct side. It may also be that the cable is simply faulty. You can check this using a working cord. If this is really the reason, then you need to go shopping. The cable is inexpensive, and there is no point in repairing it.

Problems with settings

If the system unit turns on but the screen does not, then the settings may also become a problem. This happens when the user configures a monitor resolution that is not supported. The refresh rate can also cause problems. Some monitors reset such incorrect settings on their own, and some simply refuse to work after this.

You can fix this yourself without spending a lot of time. You need to start your PC in safe mode. If in this mode the monitor shows, then we begin system recovery or reset.
To do this, go to the “Start” menu and click on “System Restore”.

Driver problems

Here, again you need to go through safe mode and reset the faulty driver. You need to go to the “Task Manager” menu and look at the properties of the video card driver.

There, click on the “Driver” tab and the “Roll Back” button. If this is not possible, then you just need to delete it.

If after this the monitor turns on, and the user sees a low-quality picture, then the problem can be solved by installing the latest driver for the video card.

Broken or incorrectly connected video card

The video card may be responsible for the fact that the system unit starts, but there is no image on the screen. And the reason may lie not only in the drivers. Perhaps the video card itself was touched during cleaning, or it was placed back incorrectly after removal. You need to remove it and insert it back, but first turn off the PC.

If this does not help, then you need to open the unit and try connecting the video adapter to another connector on the motherboard. If you have an integrated video card, you need to try connecting the screen to it, but removing the discrete one. There is a possibility that the video card is broken. This is very unpleasant and will cost a lot of money, but what can you do?

Motherboard failure

The next probable cause is a malfunction of the motherboard. The computer can start and even work, but the screen does not show any pictures. To check this yourself, you need to open the computer unit and carefully examine the motherboard.

The video card connector may be damaged. To check, you will need another video card with which to turn on the monitor.

If there is no picture through the motherboard, then there is no need to rush to buy a new one, this thing costs a lot, first it is better to call a specialist.

Problems with the operating system

If the cause of the malfunction has not yet been determined, then you need to check the operating system. It happens that when the unit turns on, something about BIOS is written on the screen, but after that there is nothing except a black screen. During this entire process, you can even hear the sound of the operating system starting up.

All this happens due to a system failure after installing strange programs that change the design and functionality of the OS. We should not forget about viruses, which have been fought for a long time, but cannot be defeated.

To make the problem go away, we again go into safe mode and restore the system to its earlier state. If everything worked out, then be sure to launch the antivirus and look for the pest.

If the problem is in the operating system, but safe mode does not start, then you will need to reinstall the operating system.

BIOS Settings

If two video cards are installed in a computer unit at once, then one of them is integrated into the motherboard, and the second is not, and the wrong device may be selected in the BIOS. The computer sometimes automatically detects the video adapter that is needed, but there are exceptions.

You will need to reset the settings and return them to default. To do this, you just need to remove the battery from the motherboard and wait a few seconds. The settings will return to standard and everything will work.

Monitor failure

If the screen stops working unexpectedly and all possible reasons are not confirmed, then the problem may be in the monitor. Power surges, mechanical damage and other causes of breakdown lead to the user not seeing the image.

Determining which part of the screen is not working is very difficult. Only people who are familiar with electronics can handle this. If you are sure that the cause of the breakdown is the monitor, then you need to contact the service center.

But checking whether the problem is really in the monitor is quite simple:

You need to check the functionality of the old power cable and test the new one;
Do the same with the connecting cable;
Connect the monitor to another device (TV, smartphone, laptop);

Other reasons

If the computer unit starts up and there is still no image, then the cord contacts may be oxidized. To fix this, you need to take alcohol and gently wipe the ends of the cable. Gold-plated contacts are more resistant to oxidation. Also, do not put pressure on the bayonets; they may bend or fly off. In the first case, they can still be aligned with a needle or a small screwdriver, but if they break, you will have to go get a new cable.

Detailed description of the problem:

FLATRON monitor does not turn on

I can't wake up the computer. The longer the computer runs, the longer it takes to wake up from sleep mode, and only the blue light is on or blinking. The computer gradually, day by day, began to increase the loading time of the desktop (it did not turn on for a long time, did not display the desktop picture, shortcuts) and the time it took to exit the energy-saving mode (hibernation) and the time it took to turn off the computer (it turned off for a long time). The monitor could start working 12 minutes after turning it on, or it could not boot up or work after 30 - 40 minutes, depending on how long it was in operating mode before I turned it off and then turned it on again... If I was holding the computer turned on for a day, then it (after disconnecting and resting) turned on earlier than when it worked without a break for 1.5 days or 2 days, or more. Therefore, it was possible to turn it on: wait for the monitor to turn on and, without waiting for it to turn on, turn it off, and do this 2-3 times in a row. As a result, I didn’t wait to turn it on; the monitor remained black all the time. It didn’t glow at all, even in short flashes, and only one blue indicator light was on or blinking. But on another day, after 3 attempts to turn on and turn off the computer, you might finally get lucky and the monitor would wake up, the desktop would appear, and the computer would work perfectly... it worked like that for all the hours - until it turned off, and it worked for 10 hours and 20 hours and 48 hours... - uninterruptedly. Then, the next day (after switching on again) everything started again (in a cycle). Question: Why does the time it takes to wake up from sleep mode and/or completely rest the computer gradually increase, and the time to turn off the computer lengthens (I couldn’t turn off right away, I had to wait)? Every day (for two months) the computer took longer and longer to boot and turned off longer and longer, but depending on the duration of the previous period of work, how long I did not turn off the computer... What is this violation connected with? The monitor was in good working order and all the components of the unit were good, because after a long awakening everything functioned perfectly, but the time of waking up and loading the desktop only lengthened. Therefore, nothing was clear what was happening... Computer parts cannot alternately be faulty, and then work, and then break down and then work, as if nothing had happened, and - again - on their own, for no reason at all. out of order, work and then remain idle. This means: The Beast acts remotely on the contacts, because the Beast usually always sends waves to chips (including airplane black boxes) and to contacts when it wants to disrupt the operation of electrical equipment. Therefore, some users MISTAKENLY think that they use the computer too much (without turning it off), which causes it to break down. The Beast may or may not harm... it all depends on the rules of the Beast... and (in this case) on the picture of the logo... Because all the sabotage, (secretly) orchestrated by the Beast, begins with a picture - a smiley, which (in the prototype) is like this , is displayed on the monitor as the letter “G”. There, next to the “LG” logo, there is also a “smiley” formed by these two letters. At first, after the computer was running for a long time, turning it off and resting, as soon as I pressed the start button again to turn on the computer, the monitor turned on after 2-3 minutes - I had to wait so long. Then (another time) after 5 minutes the monitor turned on, and so - every day more and more time passed until the pictures appeared on the monitor. t of the unit is normal, the unit did not overheat, and the monitor is working properly, but the feeling was created that the system was slowing down, as if it was freezing at the moment of loading the desktop, waking up; There is a long “freeze” of waking up and a long “freeze” of turning on the monitor, and not a freezing of the working (awakened) system or computer program. What really happened? Here's what: Two monitor plateau capacitors failed due to overvoltage, power surges in the network. The capacitors gradually burn out (failure), turn after turn... and therefore: the monitor gradually becomes covered, and may or may not turn on. These capacitors have 4 silver petals at the top, and these petals are swollen - barely noticeable, on one of the capacitors it is almost impossible to see the swelling, they look quite even (flat) because they have just begun to deteriorate. For the Beast, there are Signs in the capacitors: the number 4 and “flower” (petals). But what does the “smiley” have to do with it? Here's the thing: the monitor started to malfunction after I looked (with a special glance) at the image of a smiley - downloaded from the Internet. The beast does not like My gaze, and it begins to harm. The Beast from time to time sends waves into the computer and freezes - very often (by the way, it is also the Beast - “other” and the computer, sometimes, suddenly turns off or reboots), and now, it has begun to harm the monitor specifically. The Beast, acting on the capacitors with waves, stops their operation, because the Beast creates increased pressure (voltage) of the electric current. And also - in the monitor power connector... there are contacts and they need to be updated: that is: with a soldering iron, heat the solder to a liquid state - melt it and immediately let the molten solder harden, without changing the contacts themselves, without touching them. When a relative did everything like this for Me, at My request, the monitor started working again. It turned on at lightning speed without any problems, the yellow indicator light came on again, and everything loaded as it should and started working. And before this, the indicator was always on, only blue, or the blue light was constantly blinking. At first, a relative recommended that I take the monitor to a service center, and then he concluded: “The monitor is dead (the service won’t help)!”, and we also started looking for advertisements on the Internet for the sale of used monitors. After everything, in the end, it turned out that damaged capacitors and contacts of the power socket (connector) were to blame. Currently, when I write all this to you, the computer is working perfectly, the monitor has been successfully repaired!

Here are the TOP 10 most common malfunctions of LCD monitors that I have personally experienced. The rating of faults is based on the personal opinion of the author, based on his experience working in a service center. You can take this as a universal repair manual for almost any LCD monitor from Samsung, LG, BENQ, HP, Acer and others. Well, let's go.

I divided the malfunctions of LCD monitors into 10 points, but this does not mean that there are only 10 of them - there are many more of them, including combined and floating ones. Many of the breakdowns of LCD monitors can be repaired with your own hands and at home.

1st place – monitor does not turn on

at all, although the power light may blink. In this case, the monitor lights up for a second and goes out, turns on and turns off immediately. In this case, tugging at the cable, dancing with a tambourine and other pranks do not help. The method of tapping the monitor with a nervous hand usually doesn’t help either, so don’t even try. The reason for this malfunction of LCD monitors is most often the failure of the power supply board, if it is built into the monitor.

Recently, monitors with an external power supply have become fashionable. This is good because the user can simply change the power source in case of breakdown. If there is no external power source, you will have to disassemble the monitor and look for a fault on the board. In most cases, disassembling an LCD monitor is not difficult, but you need to remember about safety precautions.

Before fixing the poor guy, let him stand for 10 minutes, unplugged. During this time, the high-voltage capacitor will have time to discharge. ATTENTION! DANGEROUS TO LIFE if the diode bridge and PWM transistor burn out! In this case, the high-voltage capacitor will not discharge in an acceptable time.

Therefore, EVERYONE check the voltage on it before repairing! If dangerous voltage remains, then you need to discharge the capacitor manually through an insulated resistor of about 10 kOhm for 10 seconds. If you suddenly decide to short-circuit the terminals with a screwdriver, then protect your eyes from sparks!

Next, we proceed to inspect the monitor’s power supply board and replace all burnt parts - these are usually swollen capacitors, blown fuses, transistors and other elements. It is also MANDATORY to solder the board or at least inspect the soldering under a microscope for microcracks.

From my own experience I will say that if the monitor is more than 2 years old, then 90% there will be microcracks in the soldering, especially for LG, BenQ, Acer and Samsung monitors. The cheaper the monitor, the worse it is made at the factory. To the extent that the active flux is not washed away - which leads to failure of the monitor after a year or two. Yes, yes, just when the warranty ends.

2nd place - the image blinks or goes out

when you turn on the monitor. This miracle directly indicates to us that the power supply is faulty.

Of course, the first thing you need to do is check the power and signal cables - they must be securely fastened in the connectors. A flickering image on the monitor tells us that the monitor's backlight voltage source is constantly jumping out of operating mode.

3rd place - turns off spontaneously

after the time has elapsed or does not turn on immediately. In this case, again, there are three common malfunctions of LCD monitors in order of frequency of occurrence - swollen electrolytes, microcracks in the board, faulty TL431 chip.

With this malfunction, a high-frequency squeak from the backlight transformer can also be heard. It typically operates at frequencies between 30 and 150 kHz. If its operating mode is disrupted, vibrations can occur in the audible frequency range.

4th place - no backlight,

but the image is viewed under bright light. This immediately tells us that LCD monitors are faulty in terms of backlighting. In terms of frequency of occurrence, it could be placed in third place, but it is already taken.

There are two options - either the power supply and inverter board burned out, or the backlight lamps are faulty. The last reason is not common in modern monitors with LED backlighting. If the LEDs in the backlight fail, then only in groups.

In this case, the image may darken in places at the edges of the monitor. It is better to start repairs by diagnosing the power supply and inverter. The inverter is that part of the board that is responsible for generating a high-voltage voltage of about 1000 Volts to power the lamps, so under no circumstances should you try to repair the monitor under voltage. You can read about repairing the power supply for a Samsung monitor on my blog.

Most monitors are similar in design, so there shouldn't be any problems. At one time, monitors simply fell off due to poor contact near the tip of the backlight. This can be cured by carefully disassembling the matrix in order to get to the end of the lamp and solder the high-voltage wiring.

A simpler way out of this unpleasant situation can be found if your friend-brother-matchmaker has the same monitor lying around, but with faulty electronics. It won’t be difficult to make two monitors of similar series and the same diagonal.

Sometimes even the power supply from a monitor with a larger diagonal can be adapted for a monitor with a smaller diagonal, but such experiments are risky and I do not recommend starting a fire at home. But in someone else’s villa, that’s a different matter...

6th place - spots or horizontal stripes

Their presence means that the day before you or your relatives had a fight with the monitor over something outrageous.

Unfortunately, household LCD monitors are not equipped with shockproof coatings and anyone can offend the weak. Yes, any decent poke with a sharp or blunt object into the matrix of an LCD monitor will make you regret it.

Even if there is a small trace or even one broken pixel left, the stain will still begin to grow over time under the influence of temperature and voltage applied to the liquid crystals. Unfortunately, it is not possible to restore dead monitor pixels.

7th place - no image, but backlight is present

That is, a white or gray screen appears on your face. First, you should check the cables and try connecting the monitor to another video source. Also check whether the monitor menu is displayed on the screen.

If everything remains the same, look carefully at the power supply board. The power supply of an LCD monitor usually generates voltages of 24, 12, 5, 3.3 and 2.5 Volts. You need to use a voltmeter to check if everything is okay with them.

If everything is in order, then carefully look at the video signal processing board - it is usually smaller than the power supply board. It contains a microcontroller and auxiliary elements. You need to check if they are getting food. With one probe, touch the contact of the common wire (usually along the outline of the board), and with the other, walk along the pins of the microcircuits. Usually the food is somewhere in the corner.

If everything is in order regarding the power supply, but there is no oscilloscope, then we check all the monitor cables. There should be no soot or darkening on their contacts. If you find something, clean it with isopropyl alcohol. In extreme cases, you can clean it with a needle or scalpel. Also check the cable and the board with the monitor control buttons.

If all else fails, then perhaps you are faced with a case of broken firmware or microcontroller failure. This usually happens from surges in the 220 V network or simply from aging of the elements. Usually in such cases you have to study special forums, but it’s easier to use them for spare parts, especially if you know a familiar karateka who fights against unwanted LCD monitors.

8th place – does not respond to control buttons

This case can be easily treated - you need to remove the frame or back cover of the monitor and pull out the board with the buttons. Most often there you will see a crack in the board or in the solder.

Sometimes there are faulty buttons or cables. A crack in the board violates the integrity of the conductors, so they need to be cleaned and soldered, and the board must be glued to strengthen the structure.

9th place - reduced monitor brightness

This occurs due to aging of the backlight bulbs. LED backlighting, according to my data, does not suffer from this. It is also possible that the parameters of the inverter may deteriorate, again due to the aging of the components.

10th place - noise, moire and image jitter

This often happens due to a bad VGA cable without an electromagnetic interference suppressor - a ferrite ring. If replacing the cable does not help, then it is possible that power interference has penetrated into the imaging circuits.

Usually they are eliminated from the circuit design by using filter capacitors for power supply on the signal board. Try replacing them and write to me about the result.

This concludes my wonderful rating of the TOP 10 most common malfunctions of LCD monitors. The bulk of the data on breakdowns was collected based on repairs of such popular monitors as Samsung, LG, BENQ, Acer, ViewSonic and Hewlett-Packard.

This rating, it seems to me, is also valid for LCD TVs and laptops. What is your situation on the LCD monitor repair front? Write on the forum and in the comments.

Sincerely, Master Pike.

P.S.: How to disassemble the monitor and TV (how to snap off the frame)

The most common questions when disassembling LCD monitors and TVs are how to remove the frame? How to release the latches? How to remove the plastic case? etc.

P.P.S.: Power supplies and frequent malfunctions of LCD monitors

Recently, monitor manufacturers are increasingly equipping new monitors with external power supplies in a plastic case. I must say that this makes it easier to troubleshoot LCD monitors by replacing the power supply. But the operating mode and repair of the power supply itself complicates the operation - they often overheat.

I showed how to disassemble such a case in the video below. The method is not the best, but it is fast and can be done with improvised means.

DIY LCD monitor repair

A common malfunction is when the LCD monitor lights up for a second and goes out. What to do in this case and how to use this TOP of faults.

It's simple. To repair your LCD monitor, follow these steps:

Step 1. Disconnect the monitor from the 220 V network and from the computer and decide whether we will repair it ourselves or take it to a service center for diagnostics at an inexpensive price.
Step 2. If you decide to figure it out yourself, then take the tools: screwdrivers, a knife or scalpel and a soft base to lay the monitor down with the matrix.
Step 3. Disassemble the LCD display, observing safety precautions and remembering the latches. How they open is shown in the animation above.
Step 4. Discharge the high voltage capacitor. This is a must! Especially if you want to achieve a positive result of the repair.
Step 5. Inspect the board for swollen capacitors, burnt transistors and microcracks.
Step 6. If any findings are found in Step 5, replace the burnt ones and solder the cracked ones.
Step 7. Check the functionality of the monitor, observing safety precautions. If everything is ok, then go to Step 10.
Step 8. Take a multimeter and test the fuses, diode bridge, transformers and transistors. Replace burnt radio elements.
Step 9. Check the operation of the LCD monitor. If the monitor continues to blink, check the voltage at the test points on the board. This requires knowledge of circuit design, as well as a service manual with an ideal circuit. Further actions are difficult to describe in general terms. This is where the creative process of the Repairman begins. To discuss, write in the comments or visit our forum.
Step 10: If you successfully repair the flickering LCD monitor yourself, do a test run for 2-3 hours in a disassembled state. After this, the monitor can be assembled and used.

Since visual information is the end product of a computer, there can be many reasons why a laptop screen does not work, and most of the problems do not even relate to the matrix itself. To try to understand the cause of the malfunction, you must first try to describe its manifestations as accurately as possible. This will also help the technician at the service center if you cannot repair the device yourself.

The image does not appear on the screen, there is no noise of rotation of the coolers and the disk drive.
The ventilation is working, the warning lights are on, the screen is black.
The display glows with a faint whitish tint. After starting the laptop, the image appears for a moment and then disappears.
There are wide or narrow, vertical or horizontal stripes on the screen.
The image flickers, appears and disappears.

The absence of a signal when the coolers and hard drive are not working at the same time most likely indicates problems in the power circuits. Does the battery have sufficient charge? There may be disturbances in the power circuits. The connectors are not seated tightly, the power paths on the motherboard are burnt out.

To check for these problems, you need to disassemble the laptop, inspect the connections of the cables and look for burnt out tracks. The tracks on the boards are very thin and restoring the connection is a task for a professional.

The laptop screen is not working, but there is still a weak image? Then it is logical to assume a malfunction with the matrix backlight lamp. First you need to check what state the screen switch is in.

The backlight switch could fail, stick, or break off. Switch sticking is often caused by liquids getting on the laptop panel. For example, many users like to drink tea or coffee while working at the computer, this seems to help maintain concentration.

If you spill even a drop of sweet liquid on the switch, it is almost guaranteed to lead to sticking. You need to find it, it is located somewhere in the area where the matrix connects to the laptop body. Using a thin screwdriver, try to gently press the lever and try to force the lamp to turn on.

A faded picture on the monitor may indicate a burnt-out matrix backlight lamp, a malfunction in the power transformer, controller, or problems with cables.

The cable could have either broken somewhere, or the thin tracks at the point of connection to the motherboard had crumbled. Repairing such thin paths is quite a risky task. Typically, it is possible to restore functionality only in 50% of cases.

If the lamp burns out or loses its brightness, all that remains is to change it. It is not always possible to find it exactly the same type as was in the laptop. Then you will have to select a replacement based on parameters and dimensions, and adjust the brightness of the lamp and the matrix itself.

You can verify that it is working if you hold the monitor screen to a bright light source. If there is still a picture, just a very dim one, this means that it does not have backlighting. Consequently, there is a malfunction with the lamp or its connection.

Often the inverter or supply transformer fails. A transformer malfunction sometimes manifests itself with a characteristic whistle or crackling sound.

Problem with video card or motherboard

If it is possible to connect an external monitor, then you can make sure that the video card is working. If the image on the external monitor is normal, the video card is working. In some laptop models, after connecting an external monitor, the matrix automatically turns off. Perhaps you just need to switch the screen again to the internal matrix. Switching is done using a combination of hot keys, look in the technical description of the laptop.

If the picture on the additional monitor is normal, the malfunction has occurred in the matrix itself or with the cable.

The appearance of distortion on the monitor screen while the laptop is running is usually associated with detachment of the chip or memory stick on the video card. The same signs should appear when connecting an external monitor.

In some laptop models, the video card is part of the motherboard. Then the repair becomes more complicated - it is impossible to simply replace the video card module.

Problems with the motherboard or video card often show up as streaks on the screen. Or the image is jerky. Here we can assume irregularities in the contacts of the motherboard or a malfunction of the chip.

Since a laptop is a portable computer, the most common causes of malfunctions are careless movement, unstable position, and movement with cables connected. All this creates conditions for the device to fall and strike the body.

Outwardly, nothing may be damaged, but some internal detachable connections have fallen off due to the shock.

If there is not even a faint image on the screen, the north bridge on the motherboard has probably burned out. There may also be problems with the matrix or missing contacts in the power cables.

The screen image is partially blank or shaky

If there is a picture on some parts of the monitor, but not on others, the matrix most likely has failed. Jitter most often occurs due to a faulty cable. In this case, the entire repair consists of replacing the cable with a new one.

Sometimes users of personal computers and laptops have problems with the fact that after turning on the power supply to the PC, the monitor does not automatically start. This difficulty may have a fairly large number of causes, which we will later try to describe in detail, focusing on possible repair methods.

First of all, it is important to mention that monitors come in a wide variety of sizes and models, but they are all equally susceptible to the same problems. Thus, this article will suit you regardless of the type of screen you have.

We touch only on modern types of monitors used by the vast majority of personal computer users.

All the material in the article is provided to solve problems with a computer screen that previously worked stably. If you purchased a completely new model and after turning on your PC it does not work, you should contact the place of purchase directly with a complaint.

The warranty period of the device is limited to personal intervention in its operation or a predetermined time from the date of purchase - remember this.

Moving on to consider the causes and ways to solve problems with the monitor, we note that you can always contact technical specialists to diagnose and repair the screen. However, this should be done only as a last resort, in the absence of a guarantee or after independent analysis and attempts to eliminate problems.

Reason 1: Power outages

The most common problem in which the monitor does not start automatically when the computer is turned on is a lack of power. In this case, this malfunction can be expressed in different ways, but in general, the screen itself will not be activated at all.

In order to easily diagnose this type of malfunction, pay attention to the LED indicators for power and operating mode. If the monitor somehow shows the presence of power from the mains, you can immediately move on to the next method.

This method under no circumstances touches the laptop matrix, except when connecting external screens.

In cases where there are simply no indicators on the screen, try disconnecting the monitor cord from the computer system unit. Provided that the device automatically started and presented a screen with an error message, you can safely proceed to consider problems with the video card or system settings.

All things considered, if your monitor does not show any signs of stable operation, you should try changing the power supply cable from the monitor.

A situation may arise that changing the network cable will not bring the desired results, as a result of which the only way to solve the problem is to contact a specialist or replace the device.

In addition to the above-mentioned malfunctions, it is necessary to make a reservation that the screen can simply be turned off by using the power buttons.

By following the instructions, diagnosing power outages is quite simple. The main thing is not to forget to check all possible failures in the electrical network, including both the network cable and the power source.

Reason 2: Cable faults

This method is rather complementary, as it is partially related to the previous cause of the monitor failure. However, in this case, the risks of screen failure are much lower than with power supply problems.

A possible problem is that the cable usually connected through the HDMI interface may be damaged. To diagnose and also solve this problem, try replacing the wire connecting the system unit and the monitor.

Be sure to ensure that the image transmission cable is securely connected to the appropriate connectors.

Sometimes, when connecting a modern monitor to older models of motherboards or video cards, it may be necessary to use special adapters. The reliability of the contact, as well as the serviceability of such an adapter, must be double-checked.

If possible, try connecting another screen with working wires and connection interfaces to the system unit.

Check the monitor's functionality by connecting it to another PC.

If you managed to launch the screen using the described manipulations, this article ends for you.

Reason 3: Problems with the video card

Conventionally, this problem can be divided into two parts, concerning discrete and integrated video cards. In this case, the approach to diagnosing and resolving a malfunction is, as a rule, always the same.

After using the video card built into the motherboard, you should switch to using discrete memory as a test. If this is not possible, you need to find a suitable replacement for your motherboard, following the appropriate instructions.

In the case of a laptop, if the built-in memory fails, you will not be able to switch to using a discrete video card on your own.

If you have difficulty connecting your monitor to a discrete graphics processor, you should disassemble the system unit and carefully inspect the video card connector. Inspecting and cleaning the card's connecting pins and installing it correctly can help resolve screen problems.

We can end this section of the article here, since if the problems persist, the only solution will be to completely replace the video card.

Do not try to repair a faulty device yourself - this could cause failure of other PC components.

Reason 4: Incorrect monitor settings

Almost any personal computer monitor is equipped by default with special settings that allow you to edit some display parameters. It is because of incorrect settings that the screen may remain turned off or display a distorted picture while starting your PC.

To resolve this situation, you should use the technical specifications of your monitor and, in accordance with it, reset the settings to factory settings. At the same time, remember that such parameters cannot cause difficulties, since all the necessary tools are located directly on the body and have the corresponding symbols.

In case you cannot use the specification, we suggest you read our special instructions.

In addition to the above, it is important to pay attention to the BIOS settings, which allow you to disable the graphics processor built into the motherboard by default. If your computer is equipped with a discrete graphics card, turn off the built-in memory in the BIOS or, alternatively, reset the general settings.

Reason 5: Driver problems

In some also quite common cases among PC users, the monitor itself works stably, but sometimes the image is greatly distorted, demonstrating various kinds of artifacts. Here the cause may well be a damaged or completely missing video memory driver.

Drivers play an important role in the system, regardless of the type of GPU used.

Following the special instructions on our website, run diagnostics of the system to determine if there are any missing drivers.

Subsequently, download and install the appropriate software for your GPU.

As a last resort, you can use special software from third-party developers designed for in-depth diagnostics of the video card for any failures.

Reason 6: Unstable OS operation

Unstable operation of the operating system can cause problems not only with the monitor, but also with many other components of the computer assembly. Because of this feature, it is extremely important to diagnose possible operational problems in a timely manner and eliminate such malfunctions.

Drivers, although they relate directly to the OS, are still separate software.

An example of a malfunction in the Windows OS is a situation in which the screen fades before the welcome screen. At the same time, the system boot indicator itself, as well as all possible BIOS controls, remain in working order.

You can get a few more details and ways to resolve this situation from a special article.

In addition to the instructions provided, you should also use services to scan your operating system for viruses. This is due to the fact that some types of malware can cause the system to fail to fully boot.

In addition, you can take advantage of the opportunity to switch to safe mode and from there scan the system for viruses and then remove them using special portable programs.

Do not forget that difficulties can also be caused by incorrect operation of the system registry.

This is where we can finish with this method, since we have looked at all possible general methods for correcting errors in the Windows operating system.

Reason 7: Fatal system errors

The last way to solve problems with a non-working monitor is to completely reinstall the Windows OS by using exactly the same distribution. Please note that this approach is a kind of last resort for those cases when other methods have not brought the desired results.

The method will be relevant only if the screen fails to launch from under the system when the device is working properly.

To make the process of uninstalling and installing Windows easier, use the special instructions on our website.

Conclusion

To summarize, it is important to make a reservation that all instructions presented throughout the article require strict compliance with the instructions. Otherwise, taking certain actions without proper understanding may cause additional malfunctions.

Do not forget that some problems require an individual approach, with which we can help you through the comments block below.