my camera is not working

My JVC digital video camera (model #: GR-D250U) is not working well. I tried to import my iMovie back onto my camera, i have an iBook G4 from mac. It didn't record back correctly, I think it was because it had to much. Now, for some reason, my camera's play back mode is messing up my other cassettes. When I play it back, there are large black lines that go horizontally across the video. It was about a 5 minute movie. Please help me.

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