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Computer wont turn on when 2x2 connector is plugged in.

When i plug the 2x2 connector into my motherboard my computerwont start, it just turn on for like 1sec then turns off. When its notplugged in and just the 2x12 one is, all the fans on the video card,cpu heatsink, and case fans turn on fine and the computersstays on. But i cant do anything because the screen is just blank andnothing happens. I'm pretty sure the psu is not the problem because itran my other computer just fine. And its 730w so im also pretty surelack of power isnt the problem either. I dont think that the problem isit getting shorted out/grounded on the case either because it wont worksitting on my table either. Can anyone help me?

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