Got new motherboard installed friday and all is working great until i come back college and hookup computer. Turned it on, working great it running for 10 min, I go out of room and the screen is blank. Restart and nothing. Turn it totally off for a few min. Turn it on and it works fine. After a few minutes it goes blank again. I repeat again and go into BIOS to try and see if something is wrong. Everything seems fine. Then screen goes blank again in BIOS. Whats wrong this time?!!!