Screen Alignment problem

[Coronach]

My wife's PPC-6700 has developed a new quirk. The screen constantly loses its alignment. At least once per day, screen taps will be off by far enough to be seriously annoying, and to make use of the side scroll bar. She re-aligns the screen, and it s fine for a few hours, then off again.

Just in case, we have cleaned the screen thoroughly, and stopped using screen protectors. It still does it.

Any ideas? Is the screen dying?

Thanks,

Mike