Is the BIOS classified as "software" per se--I don't know? If so, this is the wrong forum.
Anyhow the other day I upgraded my RAM by inserting 2 new memory modules. But my computer would not boot, I checked and discovered one had not been seated correctly. I corrected that and then my computer booted. However, the BIOS screen popped up a message that my keyboard was missing or inoperative. It had a "continue" button, so I elected to continue. But my keyboard would not work in any program and the Num Lock light stayed on. I tried another keyboard--waste of time. After a bit it occurred to me that maybe there was a BIOS setting that needed changing. Well, I checked every entry in the BIOS, including expanding it and found nothing that I thought related to the keyboard or Num Lock key. So I simply exited without changing.
I then booted and the Num Lock light was out and the keyboard worked just fine.
Would someone give me their take on how my keyboard worked again when all I did was go into the BIOS and back out without changing anything?