You might try this link. I have a video card that won't output to screen above 1680x1050 resolution on one of it's DVI outputs (Once I try 1080p it's completely black). Seems to be what you are describing. I suspect in my case it's a poor single link DVI cable that I'm using. I'll replace with a better quality dual-link DVI cable from monoprice eventually, your situation might be the same but I'm not sure.
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