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That's tricky to diagnose. You might want to look in /var/log/XFree86.0.log, which will give you some more details that may help you find out what's wrong.
Better yet, go ahead and post /var/log/XFree86.0.log and /etc/X11/XF86Config-4, and that may give enough information for someone here to figure out what's wrong.
Check the "Monitor" settings in the /etc/X11/XF86Config file.
Your Horizontal and Vertical Refresh Rates may be incorrectly set.
These ranges can be obtain from the menu system on your monitor or from the manual.
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