Black Screen in viewer but Audio plays back - AVI file

Hello, I am a real novice but am slowly learning video editing (trying to graduate from iMovie to FCP).
I am working on a Dual 2GHz PowerPC G5 / Leopard / OS X 10.5.6 / and running FCP 6.0.1
I have imported AVI files to FC (taken from a Flip camera) and once I drag the file to the viewer the only playback I get is audio. (Inserting to canvas doesn't change anything).
I have also tried importing to QuickTime Pro 7.6 and Mpeg Streamclip (which I thought would do the trick for sure - I figured I could convert the file and try again in FCP) but also only got audio playback. I thought perhaps I needed the DC30 Xact Driver from Streamclip but it is not supported on the G5s.
The last thing I tried was downloading mplayer osx which actually played the video!! but the audio was too fast (everyone sounded like a chipmunk).
I really want to play around with the video in FCP so what can I do to the files to make that possible?
Sorry to be so longwinded and thanks.

As you will learn the more you get into it, FCP does not like certain file formats. AVI and M2V being a couple. The reason you're only getting audio playback is because you are missing a codec. Try the perian codec pack which is a free tool that has alot of codecs in it. That might help. Also, the reason you can't convert it to another format is the same reason you can't play it. If the computer can't see/read/interpret the file then it can't change it's format for you. Your other option is to convert the AVI files on a PC if you have one to Apple's preferred format .MOV
Hope this helps!

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