The left side of the keyboard does not work. Why doesn't the keyboard work?

A computer keyboard is one of the main information input devices. At the same time, if problems arise in its operation, users immediately wonder why the keyboard on the computer does not work. As a rule, in order for the keyboard to start working, it is enough to connect it to the system unit into a special PS/2 connector or USB port. But it often happens that after connection, the keyboard buttons do not respond to pressing and the lights do not light up. Therefore, let's figure out what to do if the keyboard stops working and how to solve the problem yourself.

We all know that in order to connect a keyboard to a computer, you just need to plug the plug into a special connector. In this case, the device will automatically be detected in the system and the appropriate drivers will be installed. The user only needs to wait a little. But there are times when, after turning on the computer, the keyboard shows no signs of life. There may be two reasons why the keyboard on your computer does not work.

1. Mechanical damage to the device.

• Cable damage. Check the integrity of the keyboard cable, it may be damaged;
• Broken PS/2 plug. Very often in my practice I encountered situations where the pins in the keyboard plug were bent or broken off. In order to check at the moment, pull out the purple plug and inspect the inside. If you see bent contacts, try to carefully straighten them and connect them back to the system unit;
• Problem with PS/2 connector on . It is also quite common for the connector used to connect the keyboard and mouse to fail. The solution is to install a keyboard with a USB interface;

Important! Be sure to perform all steps for connecting a keyboard with a PS/2 interface when the computer is turned off. This will allow you to avoid damage to the keyboard or port on the motherboard.

• The keyboard board or microcontroller is faulty. IN in this case, replacing the keyboard with a new one will help, since repairs will not be practical.

1. Software problem. Software failures when installing and connecting a keyboard are quite rare and are not always associated with operating system problems. Perhaps a failure occurred in the BIOS and the keyboard was disabled by software.

These are the main reasons why the keyboard on your computer does not work. Let's now take a closer look at how to solve problems with different types keyboards

Why doesn't my PS/2 keyboard work?

As I already described above, there are many reasons why the keyboard on a computer connected via the PS/2 interface does not work. If no mechanical damage is observed, then it is possible that the problem is software. Let's follow these steps to get your keyboard working again.

As a rule, when software glitch, the ps/2 keyboard refuses to work if there are errors in installing the i8042prt.sys and kbdclass.sys drivers.

Why doesn't the USB keyboard work on my computer?

Keyboards with a USB interface have long begun to replace keyboards with a PS/2 interface. USB keyboards are not so capricious and can work with USB 2.0 and USB 3.0 ports. Therefore, it makes no difference which port you connect the keyboard to. There are often cases that USB support keyboard is disabled in BIOS. We definitely check this by following these steps:

After restarting the computer, the problem of why the keyboard on the computer does not work should be resolved. Some users have problems accessing the BIOS on a USB keyboard. If this problem appeared in your case, then you should find a keyboard with a PS/2 connector, go into the BIOS from it and make the settings. After that, restart the computer and connect the USB keyboard.

Brief summary.

As you can see, today we figured out the reasons why the keyboard on the computer does not work, and also found ways to troubleshoot the problem. I always advise you to check the most basic things yourself. Since it often happens that the problem, for example, is that the user accidentally pulled out the keyboard plug with his foot, the wire was damaged, or the connector was broken. In such cases, you yourself will be able to diagnose the problems and easily find solutions. If the described methods did not help you bring your keyboard back to life, then I recommend replacing it with a new one. Fortunately, their prices are affordable and will be affordable for any user.

Keyboard malfunction issues computer It’s easier to decide - there’s always an opportunity check the keyboard you are using on another computer or vice versa - connect it to your PC exactly working properly. Then act according to the circumstances.

WITH laptop Another situation is that the keyboard is built-in, that is, an integral part.

In any case, try first reboot device and go to BIOS(usually the key F2 at the time of initialization for laptops, Del or F10 for desktop PCs). It didn’t work out - there’s a high probability device malfunction, most likely you will have to contact service center. Before that we recommend check the contacts - they may be oxidized or squeezed out(relevant for PS/2) or check cable integrity- perhaps he received damage(for example, it was pinched).

If you succeeded, then the keyboard OK, we are dealing with a software glitch.

In this case, boot the system, it would be better to do this in safe mode without starting drivers ( F8 when loading). The device is functioning, which means the problem is in the drivers. Launch the OS in normal mode, right-click on the icon Computer – Properties.

Find a section Keyboards and delete everything that is in the subkey.

Then reboot computer and check if the keyboard works. In normal condition, the driver should install automatically. Here in Dispatcher you can update or reinstall driver - this one option will do, if there is a designation unidentified devices with yellow exclamation point.

The next option is system rollback to the restore point to the date when the keyboard was exactly working.

To do this we go Start/ Control Panel

Run the program here Recovery.

Launch system recovery– choose point, to which you should rollback.

A more radical way would be complete reinstallation operating system.

Enters characters when non-working keyboard possible using on-screen application.

Start/ Accessibility .

By clicking the cursor on the image of the virtual keys, information will be entered.

This is a temporary measure will simplify finding and solving the problem. For a laptop, another temporary solution would be connection regular USB keyboard to any free port.

For more advanced users, of course you can disassemble And check connection cable. We will not dwell on this in detail in this article.

The numbers on the right don't work

If only the numbers on the right do not work, first check if the Num Lock , some users may forget to turn it on.

Above is usually Num Lock mode enabled illuminated green LED turned on (in rare cases it may not be present).

If the numbers still don't print, check to see if the Num Lock button actually does the job. Sometimes this mode includes a combination Num Lock + SHIFT or another.

Also check if you have the option enabled mouse control from keyboard.

Start\ Control Panel\ Accessibility\ Mouse

There should be no check mark on the “ Keyboard control«.

The f1-f12 keys do not work

If we are talking about laptop owners, for inclusion function keys answer key Fn.

Some types of PC office devices have a " Office", you need to check its operation. In other cases it should help reinstallation drivers.

Many people are often interested in why the keyboard on the computer does not work, as well as the letters or numbers on it. We will help you solve this problem.

Keyboard doesn't work at all

Possible reasons

• Cable break
• No connection
• Lack of BIOS support
• Pollution

How to fix it?

1. Check the cable for kinks. Also check the plug, perhaps it just fell out of the connector, or the pins in it are bent, but this is if you have a keyboard with a PS/2 connector.
2. Check its functionality in the “Device Manager”, which is located in the “Control Panel”. Find the keyboard there. If it's not there, it's probably not working at all or the computer can't find its driver. So take out the keyboard and reinsert it.
3. For a USB keyboard, there is another option. Connect working keyboard to your computer and go to BIOS. To do this, immediately after turning on the PC, you need to press the Delete key (the key can be any, but, as a rule, it is Delete). Find there an item called “USB Keyboard Support” (it may be different, but the first 2 words should be “USB Keyboard”). Then activate this item by selecting Enabled and restart your computer.
4. Clean the keyboard from dirt. To do this, turn the keyboard over with the buttons facing down and shake it well. This will help remove any solid debris, such as crumbs or hair, from the keyboard. You may need to disassemble the keyboard. Turn it over with the keys on the table, unscrew the screws on the bottom of the keyboard. Try not to lose the screws! Then carefully remove the bottom without shaking the keyboard, otherwise you will lose the keys and also create another problem. Now remove the small board and clean the contacts on it. Then, remove and inspect the contact films, of which there should be 3 pieces, if they are wet or dirty with something (of course, if they are clean, then it is better not to do anything with them), carefully wash them in warm water, wipe them with a dry cloth and leave let it dry, then put everything back together.

Numbers or block of numbers do not work

Possible reasons

• Cable break
• No connection
• Disabled digital block(or Numpad)
• Pollution

How to fix it?

1. Inspect the cable and plug.
2. Then check the status Num Lock, if the indicator is not lit, then you just need to turn it on.
3. Alternatively, if you have the option to control the cursor from the keyboard enabled on your system, then you should turn it off. Go to Start - Control Panel - Accessibility - Mouse, there uncheck the "Keyboard control" checkbox.
4. And if nothing works for you, perform cleaning, the procedure for which is described above.

Letters don't work

Possible reasons

• Cable break
• No connection
• Lack of settings in the game
• Pollution

How to fix it?

1. Using the already established algorithm, check the cable with the plug.
2. If this problem occurs to you, for example, in a game, then you should go to the game settings and assign keys to actions, because they may simply not be configured.
3. Finally, clean your keyboard.

We hope that we were able to help you. Take care of your keyboard and it will serve you for many years!

Let's imagine a situation: you turned on the computer, it booted, but the keyboard does not work. And why the keyboard stopped working is not clear.

Agree, for many users this will cause confusion, and some will even decide to give keyboard for repair

It's good if you have another one at hand old keyboard, which can be used to check the overall performance of the computer. But usually it doesn’t, so let’s try to figure out why the keyboard doesn’t work and what to do to make it work again.

The advice in the article is universal. It doesn't matter what brand your device is -a4tech, logitech, genius, oklick or any other - we will try to solve the problem.

6 reasons why the keyboard on your computer does not work

Let's describe a few simple steps which may help you fix your keyboard:

1. The keyboard connector is disconnected from the computer.

Action one: Let's check if our keyboard is connected to the system unit.

This reason is the most trivial - the contact in the connection is broken system unit computer and keyboard. The keyboard connector is usually located on the rear panel of the computer system case. You can easily find it - its shape resembles a domestic standard tape connector.

To fix this problem, you just need to securely secure the keyboard cable connector in the mating connector on the computer system unit.

If necessary (for example, if the contact is unreliable), you can wipe the contacts on the keyboard connectors with alcohol.
Make sure the keyboard wire is not damaged.

Turn off the computer and disconnect and reconnect the keyboard.

You can check the functionality of the keyboard itself on another computer.

2. The keyboard is connected to the wrong connector

Action insecond: We look to see if we connected it to the mouse port by mistake, the ports for the mouse and PS-2 keyboard are located next to each other and differ only in color.

3. Checking the functionality of the PS/2 port

Action tretier: Let's look at the condition of the PS-2 keyboard port itself, and see if it's loose.

The functionality of the PS/2 port can be checked using another keyboard

4.Checking the functionality of the PS/2 connector

Act four the most common one, we look at the condition of the keyboard plug itself; it is often stepped on, inserted incorrectly, deformed and broken. If you were careless, you could bend the legs of the PS/2 keyboard connector.

The arrow shows where the thin antennae-contacts of the plug are located, which are the easiest to bend and break.

Just note that the connector itself usually purple :o).

If the legs of the connector are bent, straighten them with something thin, such as tweezers or a knitting needle.

5.Keyboard with USB interface

In order for a keyboard with a USB interface to work on some computers, you need to enable the corresponding option in the BIOS, it is called USB Keyboard Support, against this parameter can stand Disabled you need to set the value Enabled, sometimes the settings in the BIOS disappear.

I understand that you don’t want to go into the BIOS, but it’s necessary. You need to go into the BIOS and check, maybe yourself USB controller is disabled and you will need to set it opposite USB Controller value Enabled.

In this case, only the PS-2 keyboard can help; by connecting it, you can make your own changes to the BIOS and switch, for example, the option USB Keyboard Support responsible for USB operation keyboard out of position Disabled to position Enabled Only after this, having saved your changes and rebooted, will you be able to work with the USB interface keyboard. Also pay attention to the parameter USB Controller Is it turned on?

Save settings and exit BIOS

Then you need to reinstall the drivers for the keyboard. In Device Manager, you need to remove the keyboard from the list of equipment and start searching for new hardware in the Control Panel

6. Drivers are not installed

Now there are a huge number of new multimedia keyboards with additional keys which require certain drivers to work, which should come with this keyboard.

If you purchased a keyboard that came with drivers, you need to find and install them, again after you remove the old drivers.

And, of course, if you are refused wireless keyboard need to check condition of batteries or accumulators.

All of these keyboard problems are typical. Now, let's look at special cases when the keyboard does not work.

• the keyboard is locked using a key (lock) on the system unit;
• The XT/AT switch on the back of the keyboard is not installed correctly;
• There is a hardware problem with the keyboard.

The keyboard is locked using a key (lock) on the system unit

To eliminate the possibility of unauthorized access to the computer, there is a special lock on the front panel of the system unit.

Using the key included with your computer, you can completely lock the keyboard. In this case, any presses on the keyboard keys will be ignored by the keyboard controller, and upon booting the computer will display a message stating that the keyboard is locked and needs to be unlocked:

It should be noted that using a keypad lock by itself is not sufficient protection against unauthorized access. To get more detailed information For information on distributing access to your computer, see the section "How to protect the data stored on your computer."

The XT/AT switch on the keyboard is not set correctly

Most keyboards can be connected to both IBM PC/XT and IBM PC/AT computers. However, the keyboards of these computers operate in different modes. For compatibility, there is a switch for selecting the computer type - XT/AT - on the bottom panel of the keyboard.

If you connect the keyboard to IBM computer PC/XT, then this switch should be in the XT position, and if the keyboard is connected to an IBM PC/AT computer, then the switch should be in the AT position.

If the switch is in the wrong position, the keyboard may not work.

Sticky keyboard keys

The reason is that Keyboard buttons don't work, also causing one of the keyboard keys to stick. Sticking of some keys can lead to unpredictable consequences. For example, if the Del key is stuck on the keyboard, the SETUP program will launch immediately after turning on the power.

After using your computer keyboard for a long time, it becomes dirty. As a result of this, individual keys on the keyboard may become stuck, that is, after pressing and releasing a key, the contacts of the key remain closed. Since the contacts remain closed, the keyboard controller turns on the auto-repeat mode, as if you had not released the key.

The result of such sticking can be the auto-generation of a stuck key symbol and an overflow of the keyboard buffer. For example, if the “q” key is stuck and you are working with a text editor, then a very long line “qqqqqqqqqqqqqqqqqq...” will appear on the screen, which, in addition, will grow at a catastrophic speed.

1. Check to see if one or more keys on your keyboard are jammed.
2. Try pressing all the keys in a row.
3. After prolonged use of the computer, contamination occurs; to get rid of dirt, you need to carefully disassemble the keyboard, clean it of debris and wipe the contacts with alcohol; only this is a very dreary task, remember that disassembling the keyboard is much easier than assembling it.
4. Try disconnecting the keyboard from the system unit for a short time and connect it again.

To protect the keyboard from contamination, you can use a special cover that covers the keyboard from above and protects the keyboard from dust. Typically, these keyboard covers are sold along with the keyboard.

PS. It happens that the keyboard is blocked by a virus. An unlikely event, if there is such a suspicion, check your computer with an antivirus using a computer mouse

The keyboard could simply be faulty. Don’t be lazy, try connecting it to another computer, will it work :o).

Based on materials from remontcompa.ru, lib.csu.ru

It often happens that you are preparing to perform some important work, and then bam - and the keyboard on the computer does not work. What to do in this case? How to cope with this disaster? It will not be difficult to understand this and find solutions. This article will discuss a question that often arises among novice home PC users or experienced professionals. Yes, it's all about the keyboard - it sometimes works, sometimes it doesn't, but the work needs to be done. There can be many reasons for such problems, and most of them can be solved by the user himself, without leaving his workplace. The issue of purchasing a new device can be postponed until the resource of your existing “capricious” friend is completely exhausted. Apart from attention and the ability to perform actions correctly, no special skills are required from the user in the process of solving the problem. For any model of any manufacturer computer keyboard reasons for refusal to work and ways to eliminate them efficiently in a short time will be given.

Possible reasons for device failure

Using the method of the legendary Sherlock Holmes - the method of “deduction” - you can determine what is broken or what is preventing the keyboard from doing its job. Factors of such problems can be called:

• human, that is, the breakdown is caused by the actions of the user himself;
• iron, or in other words, equipment failure;
• software - violation of settings and necessary programs and their complexes.

You can understand why the keyboard on your computer does not work and what to do in this case by studying and sorting out possible reasons. Based on the identified factors, the following situations may be the causes of malfunctions in the operation of the device:

1. If the user himself, through his actions or inaction, has caused problems with the keyboard:

• The integrity of the device’s connection ports has been compromised, or its cable has been broken (squashed);
• moisture getting inside the input device due to an overfilled cup of tea, coffee or direct rain from the street;
• excessive pollution internal parts keyboards with dust, animal hair, food crumbs and other debris.

2. If the problem is in the equipment itself:

• the keyboard was not initially working;
• the electronic component of the keyboard or its individual elements have failed and require the intervention of specialists from service centers;
• short circuit or voltage surge caused by problems with other elements of the hardware part of the computer (power supply, motherboard), and failures in the centralized electrical network.

3. The main reasons for software malfunctions in the keyboard can be called:

• failure of device drivers;
• the main settings of the motherboard (BIOS) have been lost;
• disabled for some reason in the most operating system.

All of the above reasons and options for their solutions are discussed in more detail below.

The cable or port is damaged

How can I find out if this is the reason why the keyboard on my computer does not work, what should I do if confirmation of this particular problem is found? Reply to this question possible after certain simple diagnostics have been carried out. To do this, the user needs to do the following.

1. To check cable integrity:

• Look at the indication on the keyboard itself and try to turn on/off the “Caps Lock” and “Nam Lock” buttons. If the LEDs light up, then most likely the problem is not in the cable.
• If the LEDs are not lit, connect the keyboard to another free port (USB or PS/2, depending on the type of device). The LEDs lit up - the cause has been found. The problem is a damaged port.

2. How to check the functionality of the keyboard connection port:

• Take any other device with the same type of connection and try to connect it to this port - if it works, then the problem is not in the port, but in the keyboard cable or its electronic component.
• If the other device does not work, then you need to double-check the motherboard (BIOS) settings to make sure the power is turned off for the specified port.

After such a check, there should be a result that gives an understanding of what is broken, or allows you to understand that the problem is not in the cable and the keyboard port. Eliminating the problem of a broken cable or port is only possible with the help of professionals at computer and office equipment repair centers.

Faulty device

Although this is quite funny, there are times when a user tries to connect a “dead” keyboard and is very nervous that it does not work. This happens due to forgetfulness and ignorance. All the same, after going through all the points of analysis, you can easily understand everything.

It spilled just a little bit

How to understand why the keyboard on the computer does not work, what to do? But does it beep and blink the lights (or just beep)? In this case common cause Problems can occur if liquid gets inside the device: tea, coffee, drinks or just water. All this liquid is conductive, and therefore leads to a short circuit, which can cause burnout of sensitive electronic elements the keyboard itself or port controllers on the motherboard.

In order not to buy a new device, the user can carefully disassemble the keyboard and dry all the elements. With a 50 percent chance he can expect success, that his girlfriend will “come to life.”

The garbage woke up, or Oh, those kitties

Eating in the workplace, as well as the presence of pets with fur, have a very bad effect on the PC input device. And then the question arises: “The keyboard on the computer does not work, what should I do in this case?” The answer is simple - just like with a device filled with liquid, you need to complete cleaning its interior. If you're lucky, the lumps and tufts of dirt didn't have time to cause short circuit elements, and then everything will work again.

Factory defect, or Time takes its toll

The keyboard, as an electronic device, can be assembled with defects, leading to its rapid failure. In this case, it is necessary to send it for repair to the manufacturer’s service center. If warranty period service has already expired, then you need to compare prices for repairs in paid workshops and new keyboard, having chosen for yourself best solution. You can identify such problems in a way similar to diagnosing the device cable and connection port.

Power surge or computer electrical failure

If in this case the keyboard on the computer does not work, what should I do? When loading, you need to pay attention to how the computer itself behaves: everything goes as usual, or the startup occurs (does not occur) with a failure. The result of a PC failure to start may be a voltage surge in the electrical network or a failure of the power supply, which, in turn, can affect both the operation of the keyboard and the performance of the entire computer device as a whole. To determine if the keyboard is faulty, in this case you need to connect it to another computer and test it.

Drivers have crashed

None of the above worked. The keyboard on the computer does not work, what should I do? Windows 7 Genius sees keyboards well and, if possible, picks up drivers for them. But it happens that a device from another company or with special multimedia capabilities, then they are required separate installation. If suddenly such a keyboard stops working, perhaps the drivers for it have simply disappeared. It's easy to check in the "Device Manager" - if the keyboard has a yellow question mark icon, then it's the drivers.

BIOS lost settings

If the keyboard on your computer does not work, what should you do? Windows 8, as well as others more early versions The OS stubbornly refuses to connect the device. In this case, you need to restart the computer and look into the motherboard settings (BIOS) by clicking "Divide" or "F2" at startup (for some computer devices). Among the table settings, you should first compare the date and time with the real one (if it shows a very old one, then you may need to replace the battery on the motherboard), and then find the line indicating the power supply to the ports (USB or PS/2). If disabled, enable. You can also simply reset the settings to factory defaults by selecting them in the proposed menu.

Antivirus, or OS protection programs

It happens that the keyboard on the computer does not work, what should I do? But the virus beeps and at the same time displays a message about the found Trojan or malware. In this case, most likely, the drivers or the keyboard key control program were mistaken for a virus, which led to the device being blocked from accessing the operating system and, accordingly, to its inoperability. Here you will need to create an exclusion rule for the antivirus in its settings, indicating to it the location path installed drivers or programs.

It also happens that the keyboard on the computer does not work, what should I do? The virus can infect the drivers and device management programs themselves, and therefore you cannot create an exception rule. First you need to reinstall the corrupted files, and then conduct a full scan of your computer for malware.