HELP!! i have a ton of videos of my boys stored in iPhoto..They played fine on my old OSX system (leopard).  However, I just upgraded to snow leopard and then to mountain lion and now i can't open my videos at all anymore.  HELP!!

HELP!! i have a ton of videos of my boys stored in iPhoto..They played fine on my old OSX system (leopard).  However, I just upgraded to snow leopard and then to mountain lion and now i can't open my videos at all anymore.  HELP!!

Can you tell us about one or more of the video files - what are they?  QuickTime?  MP4?  Something else?  How did you create the video files in the first place?
I do a lot of video and when I upgraded to Snow Leopard I discovered that many of the QT videos that I had created previously (via iMovie & Final Cut) would not play correctly in QuickTime X - the bizarre behavior was that QT X acted as if my video files were only audio files!  I reported this to Apple at the time but never heard anything back, and there hasn't been any change in later updates to QT X.
The solution was to (re)install QuickTime 7.  But first look in your Applications > Utilities folder.  When you upgrade from Leopard to Snow Leopard, the installer normally moves the old QT 7 program to your Utilities folder.  If it's there, try using QT 7 to play one of your video files.    If QT 7 is not there, you can download and install it from here  Make sure you are running at least OS X 10.6.3 before you install QT 7.  It's even better if you make sure you are running 10.6.8 which was the last release of Snow Leopard.

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