My friend bought a GTX 980 and I put it in the system fans were spinning but, we had no picture what so ever.
But when i hooked it into the integrated Intel HD we would have picture like normal.
Our setup was slightly different as we were using a 90w laptop style adapter for the small AC adapater slot and a 230w for the larger hook in.
So the question is do we not have enough power?
Here is a picture of the GPU -
http://www.bestbuy.com/site/nvidia-geforce-gtx-980-4gb-gddr5-pci-express-3-0-graphics-card-silver-bl...