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GTX 560 SLI Black Screen

Retired
Not applicable
So I just received my second GTX 560. Both of them work fine individually, and I've hooked them up just fine. Problem is, when I click to enable SLI, my screen goes black and doesn't come back on. I've tried changing drivers and the like, but nothing will work. The screen just goes away. The only way to get it back is to uninstall them in safe mode. I read that it might be a power supply issue, but I'd like to make sure before grabbing another one, since mine should be able to power the system just fine based on some calculators.

Specs for reference:
i5 2500k @ 4.2 (3.3 for testing)
Gene-Z
EVGA GTX 560 + MSI GTX 560
OCZ ZT 750w PSU

Any help would be greatly appreciated.
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