Need help trouble shooting graphics or PSU problem

I'm in the middle of my first build, and I've run into a brick wall. The motherboard is recieving power, and so is the GPU. The problem with the GPU is it'll receive power if the 6+2 pin is connected, but not when the 6+2 AND the 6 pin connector are plugged. When I have only the 6+2 in it'll send to the monitor that I need to plug in all PCI-E cables. Also, my PSU is successfully sending power to the case. I've tried using a Molex to 6 pin PCI but that didn't work either. Also, the comp won't recieve power if only the 6 pins of the 6+2 connector are in the 6 pin PCI slot. So is this just a GPU problem? Or is my PSU under powered?

Specs if necessary.

GPU: Gigabyte Windforce GTX-970
PSU: Seasonic S12II 620

Sorry for second thread about this. I'm just really looking for an answer and trying to avoid paying a computer repair specialist.
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  1. Best answer
    While both are quality products, very likely one is faulty, try the breadboard test to discard any grounding issue, which can cause a symptom like the one you're having, other than that you'll have to try that PSU in another known working machine to find out which piece is the culprit.
  2. Well thanks for your help
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