Mac OS X 10.6: Reinstalling Mac OS X
Under some circumstances, you may need to reinstall Mac OS X. You can reinstall Mac OS X while keeping your files and user settings intact.
Note:To reinstall Mac OS X from another computer on your network, see:
To reinstall Mac OS X:
Insert the Mac OS X installation disc and double-click the Install Mac OS X icon.
Follow the onscreen instructions. In the pane where you select a disk, select your current Mac OS X disk (in most cases, it will be the only one available).
If you want to control which parts of Mac OS X are installed, click Customize, and then select the parts you want to install.
To start the installation, click Install.
If you purchased a standalone version of Mac OS X, these installation instructions are in a PDF file located on the Mac OS X installation disc.
If you need to reinstall the version of Mac OS X that was on your computer when you purchased it, or if you need to restore all the software on your computer (including Apple software, third-party applications, and other printer drivers), refer to the documentation that came with your computer.
If you need to reinstall Mac OS X and you’ve been using Time Machine to back up your applications, files, and user settings, you can easily restore this information from your Time Machine backup disk after you’ve reinstalled Mac OS X. For more information, see: