Join Date: Dec 2012
Location: Los Angeles area
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I know it's a longshot but it happened to me.
Is your video cable DVI or HDMI? In my case, it's DVI on the card, to HDMI on the monitor, and with my PC mounted on a metal rack, it's not so simple to just slide it away from the wall to see what I am doing when I plug the cable back in. So I plugged in the cable by reaching around back, doing it by feel, and dang if I didn't have distortion and a vertical line when I turned on my PC! My brand new Samsung LED Smart TV! Crap!. What happened to it? Well, DVI has all those pins... And one was bent down against another on the cable. Removed the card and checked the connector, it was ok, then straightened out the pins (it's a long cable and they aint cheap) cursing myself all the while. Plugged it back in moorree sssslooowwlllyyyyy and all was right with the world. So if you're DVI it's worth a look.
Other than that, what they say; check that the block is making good contact, any water leak (yea may be real slow one that you may not see in a few hours), even tension on screws, seated fully in the slot. I would also try a different slot if possible just to see what happens. Good luck.