Insert the Mac OS X Disc
Insert the Mac OS X installation DVD or the first installation CD. Mac OS X 10.0 through 10.4 are available on multiple CDs, while Mac OS X 10.4 and later are available only on DVD. If booted into Mac OS X, double-click the "Install Mac OS X" icon on your desktop to launch the installer. If your computer is off, press and hold the "C" key after booting the computer to force it to start from the installation disc.
Install the Operating System
Select the drive to which your current version of Mac OS X is installed. This completes an in-place upgrade of Mac OS X.
Advanced Installation Options
Click "Options" at the "Select a Destination" window to select an advanced installation option. "Install Mac OS X" installs the operating system on a drive that does not have Mac OS X installed. "Archive and Install" saves existing system files but otherwise erases your current OS X installation. "Erase and Install" clears the entire contents of the disk before installing an Apple operating system. Click "Continue" to install Mac OS X.
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