Hey guys,

So I've hit a string of bad luck with my computer. Here's my specs:

*Gigabyte 1156 P55USB3 *Intel i5 760 *EVGA GTX 770 *Corsair 750watt PSU *2x2 and 2x4 gb gskill ram *Samsung 830 and 850 SSDs *WD black HDD *Windows 7 home ultimate *All stock, no OC.

Recently I had my old OCZ vertex 2 SSD fail on me, so I replaced it with a new SSD and everything worked fine for a couple weeks. Then a couple days ago I had my display shut off on me and I had to crash my computer to restart it. It happened two or three times more, twice when playing games and once while browsing the internet. I checked up on my GPU and CPU temps and they seemed reasonable both while idle and gaming.

Yesterday I went to turn my computer on and it immediately turned itself off. The 4 mobo lights flash before turning off. Here's the troubleshooting I've done:

*Unplugged PSU, hold power button to discharge, and tried again. *Removed each peripheral to test, same results. *Tested PSU with only a fan, it ran just fine (with paper clip, not mobo) *I checked and there's no loose screws or debris touching the mobo. *Went through the Toms Hardware sticky and didnt solve anything.

Right now I just have the CPU, cpu fan, case wires, and PSU plugged in to the mobo and am getting the same results. I've googled and googled and haven't found anything conclusive. Am I looking at a mobo failure, or a PSU failure? I'm not getting any beeps from the board because its not on long enough, and the PSU passes the paper clip test but maybe it's failing under a heavier load (with everything plugged in I use around 450-500 watts of the 750 total.). I also have no spare parts available to me to test with.

Anyone have any directions to point me in?

UPDATE: My PSU tested fine with the multimeter but I decided to replace it anyways in case it couldn't handle handle under load. Everything works perfectly now, so I assume it definitely was my PSU.