Need help trouble shooting graphics or PSU problem

[cheechnya]

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

 

[cheechnya]

I really hate to bump....

 

[Thaisnang]

So this GPU does not work when all the pins that is 6+2+6 pins is connected? Looks like a problem in the GPU to me.

 

[cheechnya]

Correct. When I have the 6+2 in it boots, but only to tell me that it won't boot and that i need to insert the rest of the PCI plugs. I insert the remaining 6 and nothing happens when I hit power.

 

[Thaisnang]

Correct. When I have the 6+2 in it boots, but only to tell me that it won't boot and that i need to insert the rest of the PCI plugs. I insert the remaining 6 and nothing happens when I hit power.

You should test that GPU somewhere if possible otherwise just RMA it. I don't think the PSU is the problem here

 

[cheechnya]

Correct. When I have the 6+2 in it boots, but only to tell me that it won't boot and that i need to insert the rest of the PCI plugs. I insert the remaining 6 and nothing happens when I hit power.

You should test that GPU somewhere if possible otherwise just RMA it. I don't think the PSU is the problem here

I agree. I'm 90% sure the PSU is fine. All signs point to the GPU.