Does the OS supplied by HP work?
I have 4 computer with none working keyboard after updates.
This AM, I put an HP on line after being off line for several weeks (totally removed from home network)
Under BIOS control keyboard works. Enter password and Windows 8.0 takes over. Worked well until I ran update which had 88 updates. Upon restart , keyboard will not work. (Windows 8.0 was installed over Windows w/ all updates)
HP P7-1010 AMD processor 16 gig ram. 450 gig drive