Where did u plug that mouse/keyboard? USB or PS/2?
If it USB then u can try plug on the back of your case(integrated with motherboard).
thanks, I unplugged all usb devices and only plugged in the mouse/keyboard USB transmitter in the back, then restarted the computer, it worked. now i can't seem to get sound. I have a logitech surround sound system and all plugs are in correctly but i don't even get system sounds. When the new hard drive was installed I must have lost some functionality. I usually solve problems through trial and error so I can't tell you why or how I get things to work.