I have a similar (I think) problem with my powerbook. The problem can be a connector that supplies the screen with signal. Apparently it wants to come loose on some models. The guys at Small Dog http://www.smalldog.com walked me through a repair, which involves taking off the back cover and just plugging the (small) plug back in. I'm not an expert - your issue sounds like mine, however. The fix is easy, if that is your problem, but be careful when you go unscrewing stuff and taking it apart. --------------------------------------------------- > Vertical Stripes on Screen--I am having a problem with my TiBook G4 400mhz > 15" Powerbook. Vertical stripes obscure the screen pretty regularly now. > Any ideas? > > Yours, > > Run > (206) 760-0462