I have a ASrock 4CoreDual-VSTA system running Windows XP Service Pack 3 with a NVIDIA GeForce 8400 GS video Board. It displays normally for a while then the on screen video becomes distorted, oversized and unreadable(my mouse also freezes when this happens). I put in new case fans because I though my tower case was overheating. Now I wondering if the problem is my display. Anyone has any suggestions?