No Signal But PC Boots

Hello, I built my first computer around a year or two ago. About three months I turned it on and it said that the monitor was going to sleep every time I turned it on. When I detach the monitor cable from the graphics card it says to "Check Cable", whereas when it's attached to the graphics card it says it's going to sleep; Therefore it detects that it's attached to it. I have a 780i FTW EVGA motherboard, and the little LED signal says "FF" which means it's booting correctly, but I still get no signal. I have no idea what the problem could be. I attempted hooking up a different video card, but that didn't seem to fix the problem, I'm about to try it again however. Any suggestions?
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  1. Does your video card have a pair of DVI outputs? Check the other one...?
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