Recently, when viewing QT Trailers off of the Apple site, I've been getting bad colors on the movie.
Let me explain: the colors in the movie itself seemed to appear in horizontal bands that went across the movie as it played, like a bad, slowly rotting VHS tape.
This has, so far, only happened on this PowerBook G3 (the first G3 Powerbook that came out in black; I can't remember the code name at the moment). This model has had screen problems previously, in which the color of the screen itself flickers. I don't think this is related, since here, the color problems are restricted to the movie screen itself.
It runs OS 9.1. Any ideas what could be happening? It doesn't affect movies played from the player itself, just from within the browser (both Netscape and IE).