<HTML>Well, if you haven't then trash FCP prefs. Make sure VM is OFF as well as Apple talk. Windows should be at 50% and NOT overlapping. MIXDOWN your audio. Set monitor to thousands of colors istead of millions. Use Mac OS All + whatever extensions you need for your cpature card or video card for 2nd monitor (if you have these)as your extension set. Rebuild desktop. Zap P-ram, trash Finder prefs.
Try these things and lets see. If none of this works then you may indeed have a hardware problem.
good luck
mike</HTML>