I have a powebook g4. Recently i got tiger reinstalled because it would not boot before. It has been working fine since. I turned it off for the night last night. it went fine. now I try turning it on today. i get past the osx loading screen. now the screen had been changing between 2 shades of blue. one has a mouse clicker the other is a bout lighter and does not. any advice? other than jurwin's advice of ditch it for an intel mac?