Hi,
A couple of things I thought of...
1) Check that the keyboard isn't faulty - maybe the keys you are using don't work.
2) Re-set the BIOS on the motherboard. Eiter by means of a jumper or remove the BIOS battery (big watch type thing) and the power for a minute then put the battery back in + the power and go back into the BIOS.
3) Flash the BIOS to the latest version (ask if you need help with this).
