The card is working but there is no image. Typical monitor malfunctions

In most cases, the reason that the monitor does not turn on or there are problems with the image is the incorrect operation of the video card, incorrect settings, or an incorrect connection.

The simplest check:

1. Disconnect all wires from the monitor
2. Connect only the power cable
3. The monitor should turn on. “No Signal” appears on the screen
   After some time, the monitor switches to energy saving mode - “Stand by” (the power indicator changes color, the picture disappears)

In this case, the monitor is most likely working properly. Of course, there are possible exceptions.

You can also check the health of the monitor by connecting it to another computer.

If the monitor has proven to be inoperable, you should contact the service for diagnostics and repair. Our article will tell you what to pay attention to when describing the problem, so that when telephone conversation You were correctly advised on the price and timing of repairs.

Before calling the repair shop, find out the exact model name of your monitor. A number of models have standard faults that have long been known to service center employees.

The monitor does not turn on, the power indicator does not light up

If the monitor shows no signs of life, there is likely a power problem. Most often, this breakdown is easily fixed.

There may be a problem with the monitor's power cable or connectors. In this case, if you change the position of the power cord, the indicator may light up briefly when contact is made. If it is completely inoperable, the power supply will most likely need to be repaired.

Power indicator blinks, no picture

Flashing of the voltage indicator (cyclic power on and off) regardless of the position of the cord is a signal of incorrect operation of the power supply or main board.

The service center will determine the cause of the problem and fix it.

Power indicator is on - no image, backlight is on

Most likely the problem is in the operation of the processor board (MB) of the monitor. For diagnostics, you will have to contact a service center, since such “symptoms” do not allow you to immediately determine the cause of the malfunction. The technician will be able to give an exact answer only after examining the monitor in disassembled form.

The monitor backlight does not light up or goes out after a few minutes of operation

Sometimes the picture can be seen in reflected light, when looking at the monitor from above, from the side. The monitor responds to buttons and there is access to the menu. It is possible that immediately after turning on the monitor works, and after a few minutes the backlight turns off. The problem is in the inverter or in the backlight lamps: they burn out over time or can suddenly fail as a result of mechanical stress (for example, an impact). Repair consists of replacing the lamps or converter. For this procedure, you should choose a service meticulously: the procedure is complex, requiring a certain level of qualifications and increased accuracy from the specialist.

Screen brightness decreases and a reddish tint appears

These symptoms indicate burnout of the backlight lamps, as in the previous case. Decreased brightness and a reddish tint may occur only in a specific area of ​​the screen or throughout the entire monitor. The problem is solved by replacing the lamps, and various dark screensavers and monitor sleep mode settings serve as preventative measures. The fewer nights the monitor sits with a static picture on, the longer the lamps will last.

Stripes on the screen

The appearance of vertical or horizontal stripes on the monitor screen is a sign of a malfunction of the decoder cables. If the stripes change location, then the problem may be in the video card, and if the stripes have a constant location and color (black, white, color), then the problem is in the monitor matrix. The technicians in service centers practically do not undertake to replace cables, since there is no confidence in the success of the operation and that the problems will not return after short time. The only solution to the problem is to replace the matrix assembly. If your monitor is under warranty, contact service immediately after the stripes appear, even if there is only one stripe and it does not bother you.

If stripes appear on the monitor, warranty period whose service life has already ended, find out at the service center the cost and estimated repair time for your model. An original matrix is ​​required, and the cost can be comparable to buying a new monitor.

Image or color distortion

Usually occurs due to loss of contact in the signal cable or broken connectors. Check the signal cable(VGA,DVI) by replacement.

The DVI (digital) cable can only be switched (!!!) on a de-energized monitor!!!

If the defect persists, it is most often due to either incorrect work video card, or with a breakdown of the monitor’s processor board. In some cases it can be fixed by flashing the firmware.

The technician will be able to name the exact cause of the malfunction and the cost of repair only after diagnosis.

The monitor does not display an image from the computer, it displays messages

If, instead of the usual picture, the monitor displays a service message (“check the cable” or “ non-optimal mode"), and this state does not change after appropriate changes (replacing the cable, setting the required mode), most likely the problem is in the monitor. A number of monitor models with a MICOM processor (Samsung 710 (N/V), 713/913 lines, some Philips, LG) have a standard malfunction associated with the rapid failure of the processor. Repairing or replacing the faulty processor completely eliminates the problem.

Problems with LED monitors

LED monitors differ in the type of backlighting: LEDs are used instead of lamps. Failure of LEDs, which manifests itself as a decrease in brightness in a separate area of ​​the screen, is quite rare and can be successfully repaired.

Please note that slight unevenness in the backlight of the LED monitor may budget models already found upon purchase. In this case, the center of the screen is illuminated more than the edges. This is due to the use of cheap materials to create the scattering layers of the screen. Not ideal color reproduction is also a feature of LED monitors; they are simply not designed for professional work with color.

One of the common failures of LED monitors is screen flickering, which becomes noticeable when the brightness is reduced. For some models, repairs are limited to flashing the firmware; for others, the processor board needs to be replaced.

In the first part of the article, we looked at the case when you can’t hear the coolers and the lights on the system unit don’t light up. Today we will look at a case where the computer turns on but no image. Despite the popular belief that this is caused by problems with the monitor, this is usually not the case.

So, let's start in order.

1. On there is no image on the monitor. Check if power is being supplied to the monitor. Usually the monitor has light indication(light bulb) indicating power. If it does not light up, check the power cable that goes to the monitor. Also pay attention to the cable that connects the monitor and system unit. Change if necessary. Have you tried pressing the monitor’s power button?)) Still doesn’t work? Then let's move on.

1. If your The computer turns on but there is no picture, then this may be related to your computer's BIOS. You can reset the BIOS settings to the original ones yourself. To do this, you need to open the cover of the system unit, find on motherboard battery that supports CMOS (non-volatile memory in which BIOS settings are stored), remove it, wait a minute and insert it back. Maybe this will help.

3. Problems with RAM. Open the system unit, unlatch the latches and take out the modules RAM. We remove dust and carefully clean the contacts with an eraser. Just in case, we take out the BIOS battery, wait a minute, put everything back and try to turn it on.

4. Faulty video card.

We unclip the latches and take out the video card. We clean the dust and wipe the contacts. We look at the textolite of the video card (the platform on which the video card elements are located). If in some place it became very dark, the video card overheated repeatedly, as a result of which it could fail. We pull out CMOS battery, wait a minute, put everything in place and try to turn it on. If there is a known good video card, we try to install it. If you have a video card built into the motherboard, try connecting the monitor to it.

1. Problem with the power supply.

The power supply can supply a voltage that is suitable for the computer to hum the fans and blink the indicators, but is completely insufficient for full-fledged work. You can measure the voltage with a multimeter, but the most adequate (if you have a working power supply) option is to try connecting a known good power supply.

1. Dust, dirt, spilled milk)

A trivial but common reason that the computer turns on, the coolers are spinning, the lights on the system unit are on, but no image in the dust. After all, most users rarely look inside system case(only when such problems arise))). But dust can cause a lot of trouble, even causing computer components to fail. Therefore, we turn off the power to the computer, carefully remove the video card, RAM, expansion cards from the connectors and clean everything from dust with a brush and vacuum cleaner. You can also use a compressor or compressed air in a can.

For a significant number of people, life is simply impossible without a computer. Therefore, it is very unpleasant when there are problems with your favorite device. For example, some users experience that the computer does not see the monitor. This can happen both with a standard device and when connecting an additional device.

There are a great many reasons for this problem. Sometimes users simply forget to connect the monitor. However, most often the problem turns out to be more global. As a rule, when the computer does not see the monitor and there is no signal, the reason may lie in the hardware of the device. For example, this is a damaged cable, insufficient RAM, a video card error or even the motherboard itself. A little less frequently, problems are related to the operation of the system itself. Let's try to figure out why the computer does not see the monitor and how to solve this problem.

Power check

First of all, it’s worth starting with the simplest. No matter how absurd it may seem, sometimes everything is too obvious and it doesn’t occur to anyone. Therefore, if the computer does not see the monitor, then you need to check whether the cable has come loose and whether the device’s power button is pressed. This should be indicated by a special light indicator.

If the monitor is working properly (at least it is properly connected) and there is no image on it, then you should try pressing the menu button, which opens the screen settings control panel.

Checking the computer's operation

If the breakdown is related to incorrect operation of the PC, then this is quite easy to check. If the computer does not see the monitor via a VGA cable, then just try connecting the screen to another device. Today almost everything modern televisions equipped with the same connector. However, if it is impossible to check the operation of the monitor in this way, then it is worth paying attention to some nuances.

If the computer is malfunctioning, it may begin to flash. If any problems occur, the power button or any other indicator on the PC begins to flash red. In addition, the computer may produce characteristic sound signals. All these signs indicate that the problem is not with the monitor, but with the PC itself.

If the computer does not see the monitor and at the same time “beeps”, then this indicates possible problems with a video card or motherboard. In this case, you should contact service center or try to find out on your own which node is failing.

Sometimes the monitor is connected normally, and the PC turns on normally without any problems, but there is no image on the screen. The device may simply be in sleep mode. In this case, you can try pressing any buttons on the keyboard or moving the mouse. If the computer does not see the monitor, then do not despair, there are still many options for fixing the problem.

Checking cables

If the wires are damaged, this may also affect the operation of the device. In this case, it does not matter at all whether the computer does not see the monitor via HDMI, DVI or VGA. Any of these wires can come loose at the most unexpected moment. Most often this happens when the cable is not screwed into the back of the screen and PC, but is simply inserted.

If you are using a dedicated video card, you need to make sure that the screen is connected to it and not to the regular motherboard connector. As a rule, the system automatically turns off the standard graphics and uses the connected device. If this does not happen, then you need to disable the image feed through the “mother” manually.

Problems with the motherboard

Many people use two monitors on their PCs. If the computer does not see the second monitor, then the problem may be that one of them is powered by the motherboard, and the second by the video card.

In this case, using a different type of cable or setting up an additional screen using a different method will help. Most likely, the picture will be worse in this case.

Permission

Quite often, such problems occur when the picture quality does not match the capabilities of the monitor. In this case, the screen will not work or will begin to turn off with enviable frequency. To resolve this problem, just reboot the system and start it in safe mode. After that, just change the resolution to a lower one.

However, everything is not so simple. The fact is that modern operating systems return the original resolution after 15 seconds. Therefore, you need to click the “Save” button in time. In addition, the system may begin to persistently switch resolution when it detects more suitable parameters, in its opinion.

Another situation may also occur. For example, when the monitor does not show “signs of life” when the computer is running. In this case, perhaps the user simply connected two monitors and then disconnected one of them, but operating system for some reason I did not receive this signal. In this case, it is recommended to hold down the Fn button on the keyboard (usually it is located to the left of the spacebar) and press F1, F12 or another key (depending on the laptop model).

Go to BIOS

Sometimes users encounter literally mystical behavior of devices. For example, when when you turn on the PC, information appears on the monitor about the start of the system boot, but after that the image disappears and nothing else happens. In this case, the problem may be deeper, perhaps it's all about Windows. What to do if the computer does not see the monitor in this case?

To do this, you need to boot the system in safe mode and restore the OS using the built-in system recovery function. You can also perform a manual factory reset. However, to do this you need to have sufficient knowledge and skills.

Checking the equipment

To fix the problem, you can try disconnecting the keyboard, mouse, external hard drives, printer, scanner, speakers and all other devices. Sometimes, due to problems with third-party equipment, problems can occur in the most unexpected components.

After this, you only need to turn on the monitor and computer and wait for it to load. If this does not help, then you need to inspect all the connectors on the devices. Very often, users pull out cables too quickly, causing the ports to stop functioning normally.

If they are damaged, you can try to solve the problem yourself or take the devices to a service center. As a rule, the ports in the connectors are bent, this can be seen with the naked eye. Therefore, you can try to level them with your own hands.

CPU

Sometimes all components of the system work properly, and there are no problems with the monitor itself. This situation confuses any user. It's not surprising if the PC makes a distinctive sound and the monitor works great with other devices. In this case, the problem may be with the processor. If it fails, the computer will make a characteristic sound, but in fact the system will not boot. This is because the coolers are spinning, but nothing else is happening. At the same time, even the motherboard can produce a number of characteristic sounds. However, nothing can work with a burned out processor.

Video card

This board can also fail, thereby causing the problem described in the article. In this case, the PC will also make characteristic sounds, but it will be impossible to display an image.

To check your video card, you just need to connect it to any working system unit and try to start it. If the computer does not work with another monitor, then it’s all about this board.

Some problems can be identified using computer self-diagnosis tools. To do this, you also need to insert the video card into the system unit and run BIOS testing. If during the test the PC begins to make uncharacteristic and very sharp sounds, then the problem is with the board.

However, before you test the video card on another device, you need to check whether it is suitable for it. To do this, it is necessary to clarify not only system requirements, but also whether the connectors on the board correspond to the ports on the “mother”. To do this, you should consult with specialists or ask for advice on a specialized forum.

If all else fails, then all that remains is to contact the service center and carry out full diagnostics. It won't be cheap.

It is also not recommended to try to repair the computer yourself if the user does not have the appropriate skills and knowledge. In this case, you can cause even more damage to the car. Repairs will cost even more in the long run.

The most common malfunction is when the PC actually turns on, but does not display an image on the monitor. You see light signals on the computer case and hear the fans running inside, but nothing happens on the screen.

There are several possible reasons, why your monitor does not display information on the screen and it is important that the search for problems is organized.

Approximate order:

1. Check your monitor. Before you try more complex and time-consuming troubleshooting methods, make sure your monitor is working properly.

It is possible that your computer is working fine, and the problem is in the monitor.

2. Check that your PC is fully power cycled. In other words, make sure your computer completely completes rebooting and shutting down.

Often the computer appears to be "not working" when in fact it is simply having trouble resuming from standby or sleep mode.

Note: You can turn off your computer completely at energy saving mode by holding the power button for 3 - 5 seconds. Once the power is completely off, turn on the computer and make sure it will boot normally.

3. Diagnose the cause by code sound signal. The beep code will make it possible to quite accurately find the reason for the computer turning off.

If you were unable to solve the problem with a specific beep code, proceed to the next steps.

4. Clearing the BIOS on the motherboard will return it to its default settings. Incorrect setting BIOS can cause display problems on your monitor screen.

Important A: If clearing the CMOS fixes the problem, make BIOS changes one at a time, at least when the problem returns you'll know what changes caused it.

5. Make sure correct location supply voltage switch. If the power input voltage is not correct (varies by country), your computer may not turn on at all.

Most likely, the wrong voltage will not allow the computer to turn on at all, but it may not turn on completely.

6. Reinstall everything inside your PC. Reinstalling will restore various connections inside your computer and will very often fix this problem.

Try reinstalling the following:

• Reinstall all internal and power cables
• Reinstall memory modules
• Reinstall the cards you are using

7.Reinstall the processor if you suspect it was not installed properly.

8.Check the opportunity short circuit inside the computer. This is often the reason why the computer will not turn on at all, but it may also prevent the computer from booting completely or may not display data on the monitor.

9.Check the power supply. Just because your computer's fans and lights are working does not mean the power supply is functioning properly. PSU tends to cause more problems than any other hardware and is often the reason why full load computer.

If your power supply fails the test, replace it.

Important: Don't miss this test. Power supplies may not function properly and require replacement.

The following steps are similar to steps 8 through 12 described in the article The computer turns on and then turns off.

If the computer turns on, you hear beeps and see light signals on the case, but the image is not displayed, then the problem may lie in a faulty video card or incorrect connection components. In this article we will look at several ways to solve the problem when graphics adapter does not transfer the image to the monitor.

There are a number of reasons for this problem, each of them has solutions that vary in complexity, so we will move from the simplest to the most complex so as not to unnecessary actions if a minor problem is found. Let's start analyzing all the methods.

Method 1: Checking the Monitor

Sometimes the problem is with the monitor itself. Check if the power is connected, turned on and the cable is connected to the video card. Try replacing the cable if possible. In addition, you should carefully check that the HDMI, VGA, DVI or Display Port cable is connected correctly.

Method 2: Checking PC functionality

In rare cases, the computer does not completely go through the power-on cycle, but freezes at a certain point, which may make it seem like the problem is with the video card. For example, the most common problem is a crash when resuming from sleep or standby mode. To check this, you need to hold down the power button for a few seconds, waiting complete shutdown computer, and then turn it on again. If the problem persists, then move on to the next method.

Method 3: Determining the cause of the failure using the BIOS signal code

Each manufacturer uses different combination short and long signals, so we strongly recommend reading our article on this topic to be familiar with all the signals from your BIOS manufacturer. Based on the results obtained, try to solve the problem yourself or take the computer to a service center.

Method 4: Reinstalling components

When assembling the computer, some parts may not fully fit into their connectors or the connection may have been made incorrectly. Remove sidebar case and carefully examine everything inside. Check the wire connections with the instructions that came with your computer or motherboard. Pay special attention to the video card, whether it is well installed and connected extra food, if any. In addition, pay attention to the processor, whether it is installed correctly and securely.