found on the web:http://en.allexperts.com/q/Video-Card-Prob...d-problem-5.htm
When I was playing WOW the other day my screen looked a giant multicolored barcode. I could still see my mouse pointer moveing around so i left the game. In the desktop the barcode look was still there so i rebooted and it cleared up. But now it happens at any given time in game or just when the computer is sitting on. I took a screenshot to see if it was in the moniter or not and the screenshot looked like a barcode.
There are two possibilities....bad connection or the video card is dying :-(
Turn off the computer, open the case and remove the video card, and system RAM memory sticks, use a pencil eraser to rub the contacts on these items clean and then use an alcohol pad to clean and dry well with a lint free cloth.
Reinstall in the computer and hopefully it solved the problem.
If the problem is still there , then the 2D processor on the video card is going bad....nothing to do but get a new card. Hopefully it might be under warranty.