JUST BUILT A NEW COMPUTER USING AN ASUS P8Z68-V PRO MOTHERBOARD AND AN I3 SANDY BRIDGE PROCESSOR. WHEN I POWER UP THE COMPUTER FANS ALL COME ON FOR A SECOND, TURN OFF AND AFTER ABOUT A SECOND OR TWO THEY COME BACK ON AND STAY ON. THE CPU LED STAYS ILLUMINATED AND I DONT GET ANY SCREEN. ANYONY HAVE ANY IDEAS?