This is a picture of my laptop screen, which I bought new about a year ago. It's a Toshiba Satellite L755 with a dual-boot installation of Win 7 and Linux Mint 11. As you can see it's divided itself into thirds and swapped the left and right thirds. On the right side of each third it's got a few dozen pixel-wide vertical stripes each a pixel apart.
It's doing it in both Windows and Linux, which makes me think it's a hardware problem, and probably in the chips somewhere. I can't find much help online, but a new computer would be a major expense I'd like to avoid if possible. Anyone got any advice?