Question Win10 Keyboard Right Arrow key returns Right and Left Arrow key & Right Alt Key returns Alt and Ctrl Key

[rawfiul]

The keyboard works perfectly on other pc and laptop
I have tried uninstalling all peripheral related drivers
My BIOS and Windows are up to date
This issue is seen even in BIOS when i used search bar and used arrow keys

Only Right Arrow key is held down, but returns Right and Left arrow key :

https://imgur.com/CyvLEW6

View: https://imgur.com/CyvLEW6

Only Right Alt key is held down, but return Alt and Ctrl :

https://imgur.com/7dvIrxS

View: https://imgur.com/7dvIrxS

Only Right Alt key is held down (another tester) :

https://imgur.com/fWZYPRX

View: https://imgur.com/fWZYPRX


Clearly the keyboard is fine, but when the issue is spotted even in BIOS and in safe boot, i cant pin down what might be causing this behavior. I recently got a new motherboard and installed fresh windows.

 

[Colif]

have you got the latest bios on the motherboard?

It can only be a weird bug with the installed BIOS, can you try flashing it?

tried different USB ports?

 

[Ralston18]

Try reinstalling the Win 10 keyboard driver. The current driver may have been or gotten corrupted.

Try running the build in Windows troubleshooters. The troubleshooters may find and fix something.

Likewise try "sfc /scannow" and "dism".

https://www.lifewire.com/how-to-use-sfc-scannow-to-repair-windows-system-files-2626161

How to use DISM command tool to repair Windows 10 image | Windows Central

 

[Colif]

@Ralston18

Clearly the keyboard is fine, but when the issue is spotted even in BIOS and in safe boot,

it happens in the bios, no windows there... drivers don't work there.