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Computer randomly shut off and won't turn back on

Last response: in Systems
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Hi everyone:

I built a new computer about a month and a half ago, and it's been working wonderfully since then. Last night however, the computer decided to shut off randomly as if I lost power and now it won't turn back on.

When I press the power button, the LED's in my case flash on for a fraction of a second then turn back off.

I found out if I unplug my Graphics card's power cables (the two six pin ones from the PSU) the computer will boot and run normally (on integrated graphics).

So is the PSU the problem or is it the graphics card?

I have a hard time believing it's the graphics card.. I feel like something plugged in to a PCIe port shouldn't prevent the entire computer from booting, but I really don't know.

Specs are:
Intel Core i7 3770K
XFX AMD Radeon HD 7950
Corsair GS800 800W PSU
Asus P8Z77-V Pro motherboard
16GB GSkill Ripjaws RAM (2x8)


If you have thoughts, please post.

Thanks.

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So I brought the PSU in and microcenter said it was okay (Honestly, I don't completely believe that because they tested it so fast and didn't test all the pins. He tested the 24 pin connecter and said it was okay but I insisted he test the 6 pins, and even then he only tested one.)

So I sent in my graphics card back to XFX... This has been extremely disappointing. It better be the problem. >.>
 
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