Mac OS X 10.5 Help
Reverting to a previous Mac OS X version
If you’ve used Time Machine to back up your computer, you can easily revert to a previous version of Mac OS X if you’re experiencing trouble after installing an update.
Important: Reverting to the previous version of Mac OS X will erase any additions or changes you’ve made to the files on your computer after installing the new version of Mac OS X. To save new or revised files, copy them onto a different disk or back them up using Time Machine before you follow these instructions. Use Time Machine only if you’re reverting to a previous version of Mac OS X 10.5 (Leopard), since Time Machine is not available with Mac OS X 10.4 or earlier.
To revert to a previous version of Mac OS X:
Insert the disc you used to install the new version of Mac OS X, and double-click the Install Mac OS X icon.
In the Installer, choose Utilities > Restore System From Backup.
In the Restore Your System dialog, click Continue.
Select your Time Machine backup volume.
Select the Time Machine backup you want to restore. To restore your computer to the state it was in before you installed a new version of Mac OS X, choose the most recent backup.
Follow the onscreen instructions.
If you backed up any individual files as described under the Important message above, you can restore them now. If you backed them up using Time Machine, recover them using the Time Machine application. (You’ll find the Time Machine application in the Dock or in the Applications folder.)