The computer i just built shuts down before it will even reach the bios. It is a asus P5WD2 mother board, the a Pentium D 830, 2 gigs of pc 5200 ocz ram, 250 gig sata hard drive, 6800 gt. 480w power supply, 20 pin, the motherboard is a 24 pin, the book said this shouldn't be a problem, but what ever help you can give will be appreciated. Oh yea, as soon as i get a short beep it turns itself off.