keyboard not working

My keyboard is no longer working on my laptop. The keyboard works in Bios, but as soon as windows xp loads and I get to the password prompt the keyboard stops working.

I tried a repair reinstall, but when windows xp loads to the text portion the keyboard still does not working.

I've booted with a DOS disk and all worked fine, I've also connected a usb keyboard and mouse but this failed. I've checked the settings in the BIOS but nothing seems unusal. I can't seems to find a solution online either

Any suggestions would be greatly appreciated since I am at the end of my ropes

Thankyou in advanced

System spec:
IBM thinkpad T42
512MB Ram
40G
 
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