760k aye? That explains it. I have a build with the 760k myself, and although it's a beastly little monster for the price, it wont allow you to utilize the VGA in the motherboard. You require a dedicated graphics card for it to do so.
You can get any, but since you made the computer to game, don't expect whatever cheap graphics card you get to play anything other than mahjong and solitaire, unless you go for the graphics card you want, I can help you out with that if you need it.