No Video on a new system

So I just put together a new computer, all the parts hooked up and shit, but when I plug in the monitor I get nothing. It tells me that their is no cable hooked up. Its not the monitor as I've check multiple monitors. Only thing I could think of is my video card being shit even though I've never used it.

Any other problems it could be? Or should I just send it back to Nvidia.....