Everything works but the display

Diskordea

Honorable
Oct 13, 2012
12
0
10,510
Hey guys, I'm having a really irritating issue with a computer I recently built. It boots, everything works.... except the display. I've tried two different graphics cards, each in different slots. Tried connecting via HDMI and VGA on both the motherboard and card itself. Also tried different cables and another monitor. I think I've tried everything, but to no prevail. If anyone has any other idea what the issue could be, please share!
 

Diskordea

Honorable
Oct 13, 2012
12
0
10,510

I tried the Nvidia Geforce g100 and AMD Radeon Force3D. Neither of them use a cable for power.