You asked about getting "any Quicktime or video/movie player" to work. Please take us through the steps you do when trying to play a QT movie. And, is the "video/movie player" you can't get to work the Quicktime Player, or can't you get a DVD to play when inserted. But, please take us through what you are doing where you can't get a QT movie to play. Is the QT movie something on the internet? If so, are you sure it's a QT file? If you are trying to play a Windows Media Video file, QT will attempt to play it, but it can't unless you download Flip4Mac (as mrmacfixit suggested). QT will open but only give you a question mark or something similar. What Flip4Mac does is wrap a Windows Movie file in a Quicktime package so QT can play it. It is one of the most essential programs to have on a Mac. If you can't play a real QT file, then we need to know exactly the steps you are using, because this shouldn't be happening.