I have a very weird problem. I just built a new PC, installed windows on it and everything. Problem is, my PS/2 keyboard does not work... The num lock light is on, but they keyboard just doesnt work, it's like its not even plugged in. Whats even weirder is that if I hook up a second USB keyboard and leave it on for 5 seconds, the PS/2 keyboard starts to work. I know its not a problem with my PS/2 keyboard because I have two of them, tried them both and they both have the same problem. So what could the problem be caused by...
The rear edge of the motherboard normally has three or four mounting holes. If you have four mounts but three holes, the forth mount will short the back side of the board. Many boards have the keyboard controller on the top side, same location. So if one or more contacts goes through the board and gets shorted, the keyboard doesn't work.
That's a WILD guess, but based in actual knowledge, so play with it.
If he uses the USB keyboard in BIOS, which apparently works, he can still disable USB support even with it plugged in. USB keyboards will still work untill you exit BIOS if support is switched off. Sorry, I thought that was obvious.
The title of the topic reads 'Lack of response after USB-PS/2 keyboard switch'.
It mentions adjusting some registry settings which are apparently overridden when a USB keyboard is plugged in a machine that normally hosts a PS/2. Again, i'm not sure if this is anywhere near the solution, but problem solving is a process of elimination and not an 'i'm right and your wrong' ego trip !!
PS. here is a direct quote from the article :
'Note that a PS/2 keyboard will still allow access to BIOS and will work in the boot-loader; it just won't work correctly in Windows. (It will, however, usually work in the Recovery Console.)'