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#21
I was using 1080i instead of 1080p for awhile. It was bugging me as to why I wasn't able to use 1080p.
So I booted up my PC in the safe mode and didn't change anything, rebooted and 1080p has been working ever since.
Try booting in the safe mode if all else fails. The safe mode cures up some problems because of the drivers it loads.
Hope it works. Good Luck!!