Was it USB mouse+KB? You might want to try using PS2 KB. Or go to BIOS setting make sure your all USB port is active when booting.
It was USB, but I don't have access to a PS2 keyboard, nor have time to order one, unfortunately. I checked all the BIOS settings though, that was the first thing I tried. I also had the necessary drivers already on the flash drive I booted from, hoping it would fix it.