Can't start iMovie '08

my iMovie reports that there is no Quartz Extreme supported graphic card in the system, But I'm running a Nvidia GeForce 7800GT 256mb.
Same problem with the old iMovie '06, but there I could force the application to open. Does anyone have any suggestions?
I can run Final cut studio without problems

I have seen this before on a friends computer. As it turned out he had some sort of capture device on some bus that showed up in System Profiler as a graphics card and it was NOT Quartz Extreme supported. Apple told them that iMovie looks at all posable graphics cards on launch and if on isn't supported then iMovie will not launch and toss up that error you are seeing. Take a look at System Profiler in the "more info" button in the about this mac window. If you look at the displays section of the profile you will see all posable graphics cards. If one of them shows as not supported then there it is. Unplug that one and relaunch. Remember that my buddies issue wasn't a card at all is was some sort of capturing device that the computer thought was a graphics card. He unplugged it and iMovie launched. o you have anything attached to your computer? I really hope that helps. Good luck.

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