I only have the Myzar 10.4.6 DVD and the GMA package is not on the disc. I've searched everywhere to find it standalone but no one has it. Any ideas?
An idea - try this:
Boot into safe-mode (-x)
Insert the Myzar DVD and let it mount on the Desktop.
On the DVD, go to /System/Installation/Packages. Look for a 10.4.6 Update .pkg file (the name might be slightly different). If you can't find it, then look for BaseSystem.pkg
Drag the pkg to the Desktop where it will make a copy.
Right-click on the pkg and select Show Package Contents. Then open Contents folder.
Double-click on "Archive.pax.gz" and let it expand.
Open the Archive folder and go to System -> Library -> Frameworks.
Find the OpenGL.framework. Drag it to this folder on your OSX partition: /System/Library/Frameworks.
You will get 2 dialogs: One will say you can't do that - just click the Authenticate button and give your password. The other will ask if you want to replace the existing file - answer yes.
Go to Disk Utility and repair permissions on your OSX partition.