My Compaq keyboard is a USB connection, not PS/2.
The printer & scanner stopped working too. I ended up getting rid of all drivers & re-booting, setting all the drivers again.
Thought that had fixed it as everything started working again, even my Compaq keyboard.
I have switched off & on again a few times since then & all seemed ok until just now. The PC froze & I had to reboot, when I did it stopped at the loading screen & said no keyboard was connected, even though the light was lit on the keyboard itself.
After trying to reboot a few times & getting the same message, I plugged in my old PS/2 keyboard. The PC then booted up & my Compaq keyboard works. Why does it need the PS/2 keyboard plugged in to work? Any suggestions?