|The PS2 keyboard should work if it is working properly.|
USB keyboards need to be plugged into the rear USB jacks that are directly on the motherboard and directly connected to the chipset. Avoid front ports, USB hubs, USB ports run through internal hubs. USB ports on expansion cards, and even motherboard USB jacks that are on add on USB controllers (on motherboard but not through the chipset directly).
You have to be a little bit crazy to keep you from going insane.