Symptom
The Classic environment does not open.
Solution
To use Classic, you must already have Mac OS 9.1 installed on a separate volume that uses the Mac OS Extended (HFS Plus) format. This issue is resolved in Mac OS X 10.1 and later.
For affected Mac OS X versions, follow these steps to open the Classic application for the first time:
1. Log in to Mac OS X as an Admin user.
2. Choose Go To Folder from the Go menu.
3. Type /System/Library/CoreServices
4. Click Go.
5. Drag the item Classic Startup to the OS 9.1 Volume.
6. Open the Terminal utility.
7. Type cd /Volumes/HFSvolume/Classic\\ Startup.app/Contents/Resources
Note: In place of "HFSvolume," type the exact name of your Mac OS 9.1 volume.
8. Press Return.
9. Type chmod u+s TruBlueEnvironment
10. Press Return.
11. Type sudo chown root TruBlueEnvironment
12. Press Return.
13. Enter your Admin user password at the prompt and press return.
14. Quit Terminal
15. Open "Classic Startup" from the Mac OS 9.1 volume.
16. Click OK when prompted to add Resources.
Note: You only need to open Classic from the HFS Plus volume the first time that you use it with a specific Mac OS 9.1 System Folder. This allows Classic to install required components into the Mac OS 9.1 System Folder. Classic opens normally from the original copy on the UFS volume on subsequent use. If you change the Classic startup volume or remove the components installed by Classic, you must open the copy of Classic that you have installed on the HFS Plus volume.