Download and Install DVD Player 2.2 After Updating to Mac OS 9.0.4
Mac OS 9.0.4 requires Apple DVD Player 2.2, which is available from Apple Software Updates. Using any previous version of Apple DVD Player results in an error.
Article 25125: "
Mac OS 9.0.4: Requires Apple DVD Player 2.2."
Install Firmware Updates Before Installing Mac OS 9
For computers that need to install a firmware update, it is necessary to start up from the Mac OS on the computer's hard disk and then run the firmware update installer from the Mac OS 9 install disc.
Article 60643: "
Mac OS 9: Update Firmware Before Installing."
Starting up from Mac OS 9 CD-ROM, asks to initialize the hard drive
This issue can happen with a limited number of hard drives. To avoid this situation, open the Startup Disk control panel, select the Mac OS 9 CD-ROM, and then start up normally.
Article 60662: "
Mac OS 9: Hard Disk 'Unrecognized' Message When Starting Up From Mac OS 9 CD"
Troubleshooting Before or During Installation
You may not have a CD-ROM drive or you may encounter error messages during the installation process. Suggestions and solutions are covered in the Knowledge Base:
Article 60493: "
Mac OS 9: Troubleshooting Before or During Installation."
Resolving Software Conflicts After Installation
If your computer does not start up properly or behaves erratically, you probably have an incompatible extension, control panel, or application. For complete information, please see the Knowledge Base:
Article 60495: "
Mac OS 9: Resolving Software Conflicts After Installation."
Application Quits Because "An Update Is Required"
Some applications may receive this message when launching. Due to modernization of Mac OS 9, applications may also need a revision by the developer or author. For complete information, please see the Knowledge Base:
Article 60533: "
Mac OS 9: Application Quits Because An Update Is Required."
A complete list of Knowledge Base articles related to Mac OS 9 can be found by typing the keyword "kmos90" into the search field.
A list of articles explaining new features of Mac OS 9 can be found by searching the Knowledge Base using the search criteria "kmos90 and What's new."