I made a thread in the Tech forum, but this one seems like it gets more foot traffic. Yesterday I updated the drivers on my Radeon HD 6750 and when it was installing it suddenly stopped recognizing my second monitor. I tried a system restore and that still didn't help. The monitor that's plugged directly into the video card works fine, and because I have older monitors, the other one was plugged into the port in the blue area seen below:
Either monitor works when plugged into the video card's port, but not when plugged into the blue area's port.
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If your video card does not have a VGA port, it likely came with a DVI->VGA adapter you could use (if the card has two DVI ports).