I agree with Dale -
it appears that Win 7 is more "sophisticated", as JamesGreystone points out, so it is able to handle more sophisticated installations.
Personally, based on what I've read in this thread, the "culprit" really is/was the setup. I suspect the manual or instructions for that video card may mention something about not using both outputs/cables on the same monitor at the same time.
Perhaps someone can come up with a logical reason to do it?
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