Black screen everything else runs

Mltimpulse

Reputable
Feb 28, 2014
12
0
4,510
So I have a computer I built and today I turned it on and everything turns on fine the motherboard fans and lights turn on like normal and the video cards fan turns on as well but when I plug in a hdmi or a vga cord into my computer and turn it on it doesn't show anything the screen just stays black.
 

Mltimpulse

Reputable
Feb 28, 2014
12
0
4,510
It's a galaxy gtx550ti 1gb gddr5 video card then motherboard is a biostatistics hi-if a85w I have windows 7 It worked like 30 min ago I restarted computer and it doesn't work now