On my desktop I still use and old keyboard with PS/2 connector. My mouse an USB one, so the mouse PS/2 port on motherboard remains free.
A couple of days ago I had to reconnect my keyboard to motherboard. I was doing it in hurry and in the dark, just to the touch. A day later while restarting the machine I was surprised by message from BIOS:"No keyboard detected." However, when started, Debian had no trouble with my keyboard. It was fully functional. Today I had a minute to pull out my desktop tower and found that I mistakenly plugged keyboard connector into the mouse PS/2 port. I wish to see Windows trying to swallow this. :-) Or I am outdated on Windows skills, am I?