If you enter the BIOS, do any of the F keys work? (f1 for help, etc)? What
kind of mouse do you have, USB or PS/2? If it's a USB mouse, try pulling it
out and entering BIOS. Either way, try pulling out the mouse and entering
What arrow keys are you using on the keyboard when in BIOS? The Number Pad
arrows or the separate up, down, left, right arrow keys? If the number
arrows, make sure the NumLock is OFF.
Do these arrow keys work in windows?
Just a few more things to try.
Also, if you have a windows95 or Windows98 boot disc, boot from it (if
possible) to enter the DOS command prompt and see if you can type anything
in the A:> prompt. This will at least tell you if the keyboard CAN
communicate with the board prior to windows loading. But then again, if you
can enter the BIOS, the keyboard must be communicating.
Also make sure the keyboard is connected in the CORRECT port.
I don't mean to imply you don't know what you're doing - but sometimes it's
the simplest things that are the hardest to figure out. Good luck.