PSU boots for 1 sec then turns off

Hi i just installed an EVGA SR-2 1200w power supply into my comp the first time i booted it up worked fine but then went back and connected my hardrive it would constantly turn on and off even though mobo lights were on.

Specs* Asus P7P55D-E-DELUXE mobo
640gb western digital
GTX 460 1gb sli
Intel Core I5 750
2 answers Last reply
More about boots turns
  1. weird...recheck your connections
  2. That suggests a short somewhere. See if the problem only occurs when that particular hard drive is connected.
    Make sure you didn't plug an 8-pin PCIE power cable into the CPU power connector.
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