I have a Dell Latitude with XP. I was on line researching some info when there appeared this highlight over the bottom third of the screen. I could still see through it and went on along for a while longer. I went away and I assumed it was the web site. Sometime later I come back and it is hibernating. I hit the power button the desktop reapears but the bottom third. It is still there because I can still access the icons with the mouse, I just have to guess where stuff is.
Please help if you can.