Originally Posted by Shugi
Since it's a PS/2 Keyboard, it's most likely your keyboard. Try a different keyboard and see if it fixes it. It may also be your PS/2 port, since PS/2 is not plug and play if you disconnect at any point your keyboard won't work until a reboot.
it actually hasn't happened in a few days (i didn't change anything). i expect it's just the connection being broken with the port as you said. i do have a few other ps/2 keyboards handy, but haven't tested them with this computer because i like the keyboard i'm using now.
i might pick up a usb keyboard as a backup just so i don't have to reboot, but the key input cap (or whatever it's called) on usb keyboards can be pretty annoying.