When I press the M key it indicates power

[Arezrafo]

Hello! My M key suddenly stopped working. After installing PassMark I noticed that the key is still alive but undefined. When I press the key it shows power in the Last key down. Anyone please explain what does power here Means? I appreciate any help

[David (PassMark)]

Some keyboards have an Power On / Off switch on the keyboard.

Maybe it is a short circuit in the keyboard?
Are all other keys OK?

If you plug in a 2nd keyboard, does it work correctly?
(I am assuming it does as you somehow were able to type in your message above and use the "M" character).

[Arezrafo]

All other keys are functioning well. I connected Bluetooth external keyboard, it is working. Plus I can type with On-screen keyboard.

[David (PassMark)]

Keyboard might be bad in that case.