Normally it's because it's using some kind of funny screen mode. Desktop users can either tweak your gfx card to use a different refresh rate for that resolution, or alter the monitor settings to move the picture back up.
However, more difficult on a laptop. Apparently fiddling with the Fn-F keys sometimes gets it to re-jig the video settings; have you tried playing with those? Put it into crt mode briefly and change back etc... hope it might help!
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I can't understand why people are frightened of new ideas. I'm frightened of the old ones. -- John Cage (1912 - 1992)
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