All I get is a green screen

Im using Express HD to edit videos from my helmet camera but when I import them into final cut, I can preview them in the viewer but when I drag them into the canvas to add it to the sequence and render it, all I get is the audio and a green screen. The files are .avi and quicktime can play them, any help would be greatly appriciated. Thanks, Harry

Trash your preferences
http://www.fcpbook.com/Misc1.html
reboot and then open the video file in QuickTime and look at get information. What exactly does it say about the file, video and audio?

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