I too have that same problem. When I start my comp there are smiley faces or weird symbols all over the screen. When it'is in windows there are yellow vertical lines on the screen. I've tried re-installing video drivers, disabling some hardware to free up power, changing resolutions but I'm still faced witht the same prob. I have opened an "exe" file which didn't function properly prior to this happening so I suspect it may be a virus. I've scanned my comp for viruses and it detected 1 which I have deleted. Athlon64 3000, Gigabyte K8VT800 Pro, 512 ram, ATI Radeon 9600xt, 160gb WD sata, Pioneer DVR-104.