88200: iBook (Dual USB): External Monitor Flickers at 1024 by 768 Resolution describes an issue with using external non-DDC monitors with iBook (Dual USB) computers, and provides a workaround.
106443: Mac OS 9.2.1: Installs QuickTime 5, Which May Require a New QuickTime Pro Key explains what options are available if your old Pro key no longer works after upgrading to Mac OS 9.2.1.
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