I have an Asus CUSL2-C with win2k Sp2. I have a compaq keyboard from one of thier systems that was like a year old. It is USB. Sometimes, it will just stop working. So to make it work again I have to unplug it from the USB and plug it in again. Then it will work. Whats wrong with this and how can I fix it? Is it the keyboard or mobo?