Having a repeating issue. Spec is; Asus p9x79 pro, Intel Core i7-3930K, Corsair 16 GB DDR3 2133 MHz, Corsair Professional Series Gold 850, nvidia 550 ti with WD black system and storage drives and Win 7 x64.
I built the box in October and once I figured out the memory settings, it worked great until one day the whole system went black...no power...no warning...no BSOD...just off. I figured the power supply went bad, so I sent it back for a new one. When the new one came and with the box open, I noticed that the POST extender was loose a bit, so I installed the new PS and removed the POST extender and installed the coonectors straight to the mobo. Fired right up and had been working flawlessly until two nights ago when it did the same thing again...straight off, no power no warning. It tries to reboot, sends power to the board but before the drives even start to spin up, it shuts off again.