I have a strange problem with my desktop PC. It wont power up! I have the Fractal Design Define R4 case. I open it up to see if the mobo system standby LED is light up. It is, but the power button or ...

That sorta sums it up... I just put together my third computer, and the damn thing won't turn on... At all. Yes, It's plugged in. I made sure the powersupply was set to the right voltage, it was -- ...