Apple Mac Pro User Guide

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Chapter 4   
Problem, Meet Solution
If this procedure doesn’t work, you can insert the Applications Install DVD that came
with your Mac Pro to use Apple Hardware Test. For more information, see the Apple
Hardware Test Read Me file on the Applications Install DVD.
Reinstalling the Software That Came with Your Mac Pro
Use the software installation discs that came with your Mac Pro to reinstall Mac OS X
and any applications that came with your computer. Don’t attempt to install an earlier
version of Mac OS X on your Mac Pro.
Important: 
Apple recommends that you back up the data on your hard disk before
restoring software. Apple is not responsible for any lost data.
Installing Mac OS X
You can reinstall Mac OS X and applications such as Address Book, iChat, iCal, Mail,
and Safari.
To install Mac OS X:
Back up your important files.
Insert the Mac OS X Install DVD that came with your computer.
Double-click Install Mac OS X.
Follow the onscreen instructions. In the pane where you are prompted to select a disk,
select your current Mac OS X hard disk (in most cases, it will be the only one available).
To control which parts of the Mac OS X are installed, click Customize, then select the
parts you want to install. Click the disclosure triangle next to Applications to select the
checkboxes for any applications you want to install.
Click Install to start the installation.