My sisters laptop, Compaq nx6325 2006 model, running Windows XP, has vertical differrnt colored lines across the entire screen. They are various widths, but all under 1/32, there is no repeat in the pattern. You can operate the computer with out any problems, when you have a window open you can see through the lines. All drivers and XP are up to date. I opened the laptop in DOS and the lines are still there. Any ideas? Two years ago she had black, white and blue vertical lines, I contactedHP and sthey had me download a fix and it worked. I called them and because her warranty was out, they would not respond.