What video card are you using, and what driver version? Are you using DVI or VGA? If VGA, are you using an adapter? What is your refresh rate set to? What resolution are you running it at when problem occurs?
video card is geforce 6800 GT OC.
im using DVI that i bought on ebay for $6.00
res is 1440x900
refresh is 60hrtz i tryed 75 hrtz tho to no diffrence cept the mouse is faster