It does sound like a problem with your refresh rate and/or your horizontal sync range. If you set your horizontal sync range too low or too high you can fUx0r a flatpanel pretty easily. Most flatpanels are supposed to complain when you do that, but perhaps yours does not.
If you still have Windows installed, boot it and write down what the horizontal sync and vertical refresh rates are. Then try those values in XF86Config and see what happens when you only start the X server (don't run startx, just type X and hit Enter).
/me \/\/@|\|t5 $$$$$ F0r @|\| u65r 3|33t G@/\/\1|\|G r1G
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