Keyboard error at boot.

Cause:

An error with the keyboard can be caused by any of the below
possibilities.

Keyboard is not connected properly.
Stuck key
Bad keyboard
Bad PS/2 or AT port
Solution:

Keyboard is not connected properly

Verify that the keyboard is connected properly to the computer by
disconnecting and reconnecting the keyboard to the computer.

Stuck key

Ensure that there are no stuck keys on the keyboard. If all keys appear
to be ok and you have a standard desktop computer with keyboard,
attempt to turn keyboard over and gently hit the back of the keyboard
to loosen any dirt or hair that may be stuck in the keyboard.

Bad keyboard

Try another keyboard on the computer to verify that the keyboard has
not gone bad.

Bad PS/2 or AT port

If all of the above solutions are not able to resolve your issue it is
likely that the port on the back of the computer may be bad and the
motherboard or I/O board may need to be replaced.