I can't figure out this box i put together... it was working before i removed the harddrive but now i don't understand whats going on. The board starts up fine and the lights appear. I go to push the on button and the fans move and everything gets warm. So the board starts... but the keyboard num lock light keeps blinking and won't stop... nothing shows up on the screen... also i don't know if it matters or not but the keyboard is a ps/2 port. Any thoughts why I can't see anything and do anything?