Everything was fine until today all of a sudden my screen filled with the pictured lines that continue to plague my screen. I'm on a PowerBook G4 which i've had for 4 years, but it's been absolutely fine until this. The lines fade in and fade out, sometimes occupy the whole screen or patches. I've done the restart ram things but no help as well as going through my screen preferences etc. Can you have a look at my pics and help me to banish these blue lines? Cheers!