No video

I boot up my system today only to see no video appear on my old monitor. So I try to tighten the video cable (Monitor only has VGA, so a VGA-DVI adapter is used to use my card, and the adapter is still a bit loose) and try again, still no signal. I then swap to the other DVI port, still no video. I then swap back to the last port, same story. Odd thing is, it was working with no problems at all last night.
So my computer will boot up, but I can't get anything on my monitor, any ideas?

FWIW: sometimes turning it all off and then removing the video card, then reseat it good a couple of times will loosen any crud or corrosion that might be on the paddleboard to the motherboard.
All bets are off if your video is part of the motherboard.

Rich
I have done it a couple of times on an older PC and it worked..

I removed the 6-pin power from the card and reconnected that and it somehow did the trick, no idea how that worked though . . .