Hi i have a GeForce 4 ti4200 graphics card & the last few days the screen keeps breaking up you cant make anything out @ all, ive tried new drivers, checked that the fan on the card is working ok, taken that card out & put is back again & i still get the same problem ??? only new part on my pc is the xp2800 cpu could that be anything to do with it ??? thanks for any help you can give.