Hi mario g1,
Thank you for reaching Microsoft Community. We're sorry for the trouble this has caused you.
I am aware of the problem you are having with the keyboard on your Surface Pro X, which has stopped functioning. I am here to help and let us both isolate the issue.
It seems like you’ve already tried a number of troubleshooting steps. Allow me to ask some questions to further isolate the issue.
- May I know what form of reset you have gone through?
- Is the new keyboard you bought also not functioning on the Surface? If yes, the issue more likely with your device hardware.
If the LED lights don't turn on, there might be a hardware issue. To verify in UEFI, do the following:
- Turn off your Surface and wait 10 seconds.
- Press and hold the Volume Up button—and at the same time, press and release the Power button.
- You'll see the logo screen on your screen. Continue to hold the Volume Up button. Release the button when the UEFI screen appears.
- Press the up and down arrow keys to change what is selected on the left side menu to check if the keys work or not.
If the keys are still not working correctly: If the Type Cover or Keyboard still doesn’t work on your Surface, then we know it's a hardware problem.
I value the time and effort you have given out in trying to resolve the problem. Your Surface's type cover connector port, which has a tendency to fail to recognize the keyboard, may be the source of the issue.
Kind regards,
Lavenia