A:Answer I bought the same rig just a couple weeks ago, I had this problem when using a DisplayPort > HDMI cable, so I swapped back to using the regular HDMI > HDMI cable and it works just right.
The only things that I can think of is to 1) check and make sure your card is securely plugged into the motherboard (it can potentially come loose from being shipped/moved around, just be gentle with it), 2) download the correct driver software for the graphics card, and 3) use an hdmi > hdmi cable.
For the driver software, go to the nvidia website and download the latest driver software for your specific graphics card.
When doing so, be aware that there are desktop and notebook versions of identical graphics cards, make sure you're searching the GeForce 10 series and not the GeForce 10 series (notebooks).
Another option for getting driver software for your GPU is to right click the start button, go to device manager, find "Display Adapters" in the list that shows up, right click the nvidia graphics card and select update driver software.
I'm not trying to assume you didn't do anything listed here, but I wasn't there when this happened so I just want to make sure I covered all bases that I know of.
Hope this helps!