Try another connection between the monitor and the card. And if possible, try another monitor or a TV.
I have tried the DVI to DVI connection between the card and monitor, as well as using a DVI to VGA converter, both with the same resulting distorted image and eventual black screen.
I just tried using a different monitor, the same distorted images and black screen appeared, but this time it showed a screen saying the system did not restart properly, which I then was able to get it to boot into safe mode. From here I went to device manager and was able to update the drivers for the video card, hoping this might solve the problem. I restarted the computer from there and it just went back to the original problem.