Problems with video playback in iMovie - I have audio with black screens

Hello
I can see all of the thumbnails of my iMovie projects. However, when I try to play them, raher in the preview screen in iMovie or anyother way (ful screen etc) - I can't see anything, it's just a black screen. I have audio but no visual images.
Is anybody able to shed any light on this?
I've tried to import new clips to edit but the same problem is occuring...
Thanks!
Andy

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Problems with video playback in iMovie - I have audio with black screens

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