Now the vidieos won't play on any of my iPhoto shows or library.

Can you help me. I downloaded picturs and videos into my iPhoto program and made a slide show up. It has mostly stills and some short videos and music. It was running great and I downloaded it to some thumb drives for people on the trip. Other shows ended up downloading too (not sure why) so I deleted the show on the drives. Anyway now when I play the show on my computer none of the videos will play. On the strip I see the picture but when I play the show the screen is black where the videos are until the time has run and then next slide comes up.
Any chance you can help me fix this. None of my videos in iPhoto will play now and I get the error message that "a necessary data reference could not be resolved". I can not seem to find out how to access the data reference???
HELP

I get the error message that "a necessary data reference could not be resolved".
This means that you have corrupted or deleted these movies somehow. Restore from your back up.
Regards
TD

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Now the vidieos won't play on any of my iPhoto shows or library.

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