TS3479 I have a iMac mid 2011 with Mac OSx Lion 10.7.4. I was using iMovie suddenly today I found iMovie is not starting a window is popping up saying "iMovie requires a graphics card that is compatible with Quartz Extreme. One or more of your graphics ca

I have an iMac Mid 2011 model intel i5 with AMD Redeon HD6750M 512 MB graphic card, 8 MB RAM.
I was using the imovie the other day and down loaded some of the vedio clips from Sony camcorder.
All of a sudden today while I was trying to open the iMovie it did not a window poped up saying that
iMovie requires requires a graphic card that is compatible with Quartz Extreme................
What is these nonsence thing happening ........
Can any body provide some clue how to resolve the issue
Thanks and regards in advance
Bijan

If it was previously working then try a smc and pram reset.
If that doesn't fix it then see if vlc can handle the video.

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