Partial black flashes/stripes on exported m4v and sometimes mov????

Hi everyone,
I just bought a Canon HF100 full HD camcorder and a Class 6 8GB SDHC card which according to Canon manual should be fast enough to record full HD by the camera.
So the question is that in iMovie 08 where I've imported it at full resolution - when I export it using Share -> Export Movie and select either Medium or Large i get black flashes or stripes in the output video - note that they don't go across the whole video though
I didn't think I was getting it using Share -> Export using Quicktime but I just saw one today that only has 1 black flash but it's there
Playback in imovie shows no black flashes at all.
I've tried exporting all sizes and all qualities and see black flashes in all qualities and sizes..
Just wondering what it might be caused by???
Thanks
Jason

Problem was a faulty logic board, apple replaced it under warranty

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Partial black flashes/stripes on exported m4v and sometimes mov????

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