IMovie HD - Clips are black but audio works

We're using iMovie HD on MBP with OSX 10.6.8 to edit HD footage. The project was started on another computer using the same version of iMovie (5.0.2). On the new computer, all clips show up as black, but the audio works. The footage is full HD in .mov format at 29.97fps. The clips play fine in Quicktime, but the video doesn't show up in iMovie!
We tried importing a new .mov into the project, and the same thing happened - we hear audio but the picture is black. This clip also plays fine in QT.
Is there a codec or driver that needs to be installed to get the video working? Has anyone else encountered this issue?
Any help will be greatly appreciated! Thanks in advance!

I had this problem on my Hitachi 51" HDTV RP and HD DVR box....I went from the HDMI out to the DVI in and would lose video but not audio. Then I went to component input and all was well then it happened again. I finally figured out that since the upgrade to 1.5 IMG (new guide) I did a box reset from the Verizon internet site and have not had the problem since.
Set up your verizon account then go in "Fios Tv services" and check off your boxes and hit "reset box" and your problem should be solved. Like I said since the reset 3 weeks ago I have not had a problem. Remember, simply unplugging it then plugging it back in will not work....reset it from online.
Btw, some settings may be lost (parental controls,etc).....

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IMovie HD - Clips are black but audio works

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