Quicktime doesn't play video or audio

I'm working of a brand new Macbook with OSX 10.4.9 and I just upgraded to Quicktime Pro 7.1.3
I have a bunch of movie files that I've saved over the years that won't play. They're AVI files, and they open but all that's there is a white screen and no sound.
Any suggestions?

There is no single codec for movies that have .avi extensions. AVI is a container format, not a specific type of file. An AVI movie may use one of the Indeo codecs (there are at least four that I'm aware of, none of which have been ported to Mac OS X) or one of the various flavors of DivX, among other possibilities. You'll have to find out what codec was used for the movies you want to view to determine what you need. Note that not all codecs for the various .avi movies are available for QuickTime.
If you want to try "hit and miss", you can try the codecs at http://www.divx.com/ and http://www.3ivx.com/ and see if one of them will work for you. Perian, which rolls several codecs into one package, might also work.
If you just want to play the movie any way you can, you can also give this player a try:
http://www.videolan.org/vlc/
Forum Tip: Since you're new here, you've probably not discovered the Search feature available on every Discussions page, but next time, it might save you time (and everyone else from having to answer the same question multiple times) if you search a couple of ways for a topic, both in the relevant forums, in the User Tips Library and in the Apple Knowledge Base before you post a question.
Regards.

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