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Knowledgebase: Mac Troubleshooting
Archive and Install Mac OSX
Posted by UCS IT Support 4 on 23 February 2009 11:40 AM
Start from the installation DVD
To start your Leopard installation, simply insert the Mac OS X Leopard Install DVD and double-click the Install Mac OS X icon.

When the Mac OS X Installer opens, follow the onscreen instructions to select your Mac OS X startup disk. click the Options button on the "Select a Destination" 
installation sheet will appear asking you to choose between Install Mac OS X, Archive and Install, or Erase and Install. Select Archive and Install choice

This option moves existing system files to a folder named Previous System, and then installs a new copy of Mac OS X. This option is available only for volumes with Mac OS X already installed. Usually, select (check) "Preserve Users and Network Settings" which imports existing user accounts, home folders, and your network settings into the new system.

After the install is done restart & run software update from the Apple menu  
Install all updates and restart the computer
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