[Solved] Standard PS/2 Keyboard Not Working Windows 7, 8, 10
After you reinstall the Windows 7, 8 or upgrade the Windows 7, 8 to Windows 10, the standard PS/2 keyboard cannot work. And in some condition, it shows as a yellow exclamation mark in device manager. It means the PS/2 keyboard driver is missing or installed error.
What is PS/2 Port?
The PS/2 port is short for Personal System /2 port. It is a 6-pin mini connector used for connecting the standard ps/2 keyboard and mouse to computer. Normally it is in the back of a desktop, the purple is for the keyboard and green is for the mouse.
For do all the things to fix this error, you can try to connect an USB keyboard and mouse to operate. If you do not have one, make sure the PS/2 compatible mouse runs properly.
Method 1: Modify the I8042prt Start Value
The first three steps is to open the on-screen keyboard. Because you need to use the keyboard to type some words.
1. Enter settings window. Click the Win icon and choose Settings icon to enter settings window.
2. Choose Ease of Access.
3. Locate to the Keyboard and turn on on-screen keyboard.
So after you open the on-screen keyboard, you will see the keyboard screen on the display.
After that, you can use the mouse to click one or more word if you need to type something.
4. Enter Registry.
Type Regedit in search box with an on-screen keyboard and choose the best match result to run registry editor.
5. Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\i8042prt
The i8042prt mainly control the PS/2 keyboard and mouse.
6. Modify the Start value from 3 to 1.
Right-click the name file Start and choose Modify to enter the start value modify window. And change the number from 3 to 1.
Make sure the base is Hexadecimal.
7. Restart Computer. Unlike USB, PS/2 only detected at startup.
Now, system will detect the PS/2 port when computer reboot, and this can solve the PS/2 keyboard stop working problem.
Method 2: Remove BIOS Battery Temporary
This is mainly used for Desktop. And this will help to set all the motherboard settings as default.
1. Turn off your PC.
2. Plug out/remove the power cord.
3. Open the cabinet. And then you will see the motherboard.
4. Remove the BIOS battery for several minutes.
5. Put the BIOS battery back.
6. Connect cabinet, insert the power cord, and then restart the computer.
Method 3: Update PS/2 keyboard drivers
Sometimes, the standard PS/2 keyboard cannot use because of the wrong driver. In device manager, you can find the PS/2 keyboard shows as a yellow exclamation mark under keyboard tree.
I will recommend you to use Driver Doctor to fix the PS/2 keyboard driver issue. It will save more time. Of course, you can manually do it in next steps.
1. Right-click Standard PS/2 Keyboard and choose Update Driver Software.
2. Windows will automatically search the right driver from the Internet and install it for the PS/2 keyboard.
After installed, you will need to reboot computer to run the standard keyboard again.
If the PS/2 Keyboard still not working, following these steps.
3. You should choose to browse my computer for driver software. This will help to locate and install driver software manually.
4. Choose Let me pick from a list of device drivers on my computer. Here you will see the compatible PS/2 keyboard devices.
5. Choose the compatible PS/2 keyboard devices such as Japanese PS/2 Keyboard (106/109 key) to install it.
So installing the compatible device’s driver will help you to solve this problem.
Now, there are few people using PS/2 keyboard and mouse. Most of the people will choose USB keyboard and mouse. So, if you are using the USB devices and had a similar problem, you can solve it by these articles:
USB Mouse cannot work in Windows 10, 8, 7
USB Keyboard cannot work in Windows 10, 8, 7
USB Port cannot be recognized in Windows 10, 8, 7