iMovie requires Quartz Extreme to work properly. If you do not have Quartz Extreme, then you will probably get the following error message: “iMovie requires a graphics card that is compatible with Quartz Extreme. One or more of your graphics cards does not support Quartz Extreme."
If you receive this message, you must upgrade your graphics card. You can tell whether your graphics card is supported by following the below steps:
1. Go to Applications, Utilities and then System Profiler.
2. Go to Contents and then select Graphics/Displays. This pulls up all of the information about your graphics card and processor.
3. Scroll until your see Quartz Extreme. Look next to the name, and you will see either “Supported" or “Not Supported."
Generally, NVidia GeForce 2 and ATI Radeon or later versions are supported. Check your Mac, because depending on your system, you may not be able to upgrade your graphics card, which means that you would need to invest in a new system.
In that case, it may be better to invest in a different program.