The laptop keyboard works in the BIOS menu but not in Windows. You can enter the BIOS setup menu and navigate through the menu using keyboard keys. As soon as Windows loaded, the keyboard stops responding.

Possible cause:

Software related problem.

Possible troubleshooting steps and repair solution:

Most likely this is a software related problem. If the keyboard works on the BIOS level, it means the keyboard functions properly.

The best and more efficient way to fix this problem is reinstalling the operating system from scratch. Back up all personal data and run the recovery disc or installation CD. There is a very good chance that reinstalling the operating system will make your keyboard functional again.

One key on the laptop keyboard is not working. All other keys work properly. The faulty key doesn’t work even if you press on it very hard.

Possible cause:

Keyboard failure.

Possible troubleshooting steps and repair solution:

If you are experiencing a problem with only one key and all other keys work normal, you have a faulty keyboard. You’ll have to replace the keyboard with a new one. The keyboard is a sealed unit and cannot be repaired.

Liquid was spilled on the laptop keyboard and now some keys do not work properly. Keys either do not type at all or type wrong letters.

Possible cause:

1. Keyboard is damaged.
2. Motherboard is damaged.

Possible troubleshooting steps and repair solution:

If the laptop keyboad stopped working properly after liquid spill, you’ll have to replace the whole keybord with a new one. The keyboard is a sealed unit and cannot be disassembled and repaired.

If a new keyboard doesn’t fix the problem and some keys still do not work properly, most likely the motherboard was damaged by liquid. If that’s the case, you’ll have to replace the motherboard.

The laptop types numbers instead of some letters. For example, when you press on the following keys J,K,L,U,I,O it types 1,2,3,4,5,6.

Possible cause:

The keyboard has NumLock enabled.

Possible troubleshooting steps and repair solution:

You have NumLock function enabled on your laptop. Disable NumLock and you’ll get your letters back.

On some laptops simply press on NumLock button located somewhere in the top row. On other models you can enable or disable NumLock through the Fn (function) key.Press and hold down the Fn key and at the same time press once on the NumLock key.

Laptop makes repetitive beeping sound on startup. It starts beeping as soon as you turn it on and will not load the operating system. If you press on different keyboard keys the beeping sounds stops.

Possible cause:

Laptop keyboard failure.

Possible troubleshooting steps and repair solution:

If the laptop starts making a repetitive beeping sound on startup, most likely the keyboard has a stuck key.

In order to confirm that your problem is related to the keyboard, you can disconnect the keyboard cable from the motherboard and start the laptop while the keyboard is disconnected. If the sound is gone, you have a defective keyboard and it has to be replaced.

If you don’t want to replace the laptop keyboard, you still should be able to us the laptop with an external USB keyboard. Just make sure the laptop keyboard is disconnected from the motherboard, otherwise it will not load the operating system.

Laptop keyboard stopped working. The laptop starts as normal and loads the operating system, but non of the keys are working. The touch pad works normal.

Possible cause:

1. Software related issue.
2. Bad keyboard.
3. Failed motherboard.
4. Keyboard is not connected to the motherboard.

Possible troubleshooting steps and repair solution:

1. Test the keyboard on the BIOS level. Restart the laptop and enter the BIOS setup menu. Can you use the keyboard in there? If yes, most likely you have a software related problem. Reinstalling the operating system from scratch will fix it.

2. Test the keyboard in Safe Mode. If the keyboard works in Safe Mode but not in normal mode, again it’s a software related problem. Try reinstalling the operating system.

3. If the keyboard doesn’t work in Safe Mode or BIOS level, most likely you have a bad keyboard and it has to be replaced.

4. If the problem still exist even after replacing the keyboard, most likely it’s the motherboard failure.

If you suspect that someone worked on the laptop before, remove the keyboard and make sure the keyboard cable is connected to the motherboard.

Some keyboard keys do not work. All remaining keys works normal. The laptop works properly with an external USB keyboard attached.
Reinstalling the operating system doesn’t help.

Possible cause:

1. Bad connection between the keyboard cable and motherboard.
2. The laptop keyboard failure.
3. The motherboard has a failed keyboard controller.

Possible troubleshooting steps and repair solution:

If some of the keys on your laptop keyboard stopped working, most likely you have a failed keyboard. Before you replaced the keyboard with a new one try reconnecting the keyboard cable on the motherboard. Reconnecting the cable might help.

If reconnecting the cable didn’t help, replace the keyboard with a new one. Most likely replacing the keyboard will fix your problem.

If not, most likely you have a faulty keyboard controller on the motherboard. This type of failure is not very common but it happens. In this case you ‘ll have to replace the whole motherboard.

When you press on a keyboard key, it types two letters instead of one letter. For example, when you pressed on the letter “A” it types “AS”.
It happens only with some keys. All remaining keys work properly. You reinstalled the operating system but it didn’t fix the problem.

Possible cause:

1. Bad connection between the keyboard cable and motherboard.
2. Failed keyboard.
3. Failed keyboard controller on the motherboard.

Possible troubleshooting steps and repair solution:

When your keyboard starts typing two letters instead of one most likely you have a failed keyboard. Before you replace the keyboard with a new one, try reconnecting the keyboard cable. It’s possible that contacts inside the connector got oxidized and the cable doesn’t make good connecting with the motherboard.

If reconnecting the cable doesn’t help, replace the keyboard with a new one.

If you still experiencing the same problem even after replacing the keyboard, most likely you have a problem with the keyboard controller on the motherboard. If that’s the case, you’ll have to replace the whole motherboard.

When you open a text editor and type something, the keyboard stars typing the same letter on its own until you press on the problematic key. After that the keyboard may work fine for a while but eventually the same problem happens again.

Possible cause:

The keyboard has a stuck key. Contact under the key are shorted.

Possible troubleshooting steps and repair solution:

If the keyboard starts typing the same letter on its own, press very firmly on the stuck key a few times.
If the problem happens again, you’ll have to replace the keyboard. The keyboard is a sealed unit and cannot be disassembled for repair.