Clean Install

A clean install is frequently applied to the Mac OS as a general (and efficient) troubleshooting technique. Non-System application programmes can also be "clean-installed".
==Clean installation of the Macintosh system software / Mac OS==
===Until (and excluding) System 7.5===
To do a clean install in system versions prior to System 7.5, proceed as follows:
# Locate your installation disk (Disk 1).
# Go to the System Folder.
# Drag the Finder icon into a different folder (e.g. the Extensions folder or the Preferences folder).
# Run the installer programme from the system installation disk.
# Proceed to install the system software as usual.
===System 7.5===
To do a clean install of the system software as of System 7.5, proceed as follows:
# Run the installer programme from Disk 1 or the system installation CD.
# At the main screen (with the Install button), press command-shift-K.
# Check the option "Clean Install".
# Install as usual.
===Mac OS 9===
To do a clean install of the Mac OS as of Mac OS 9, proceed as follows:
# Run the installer programme from Disk 1 or the system installation CD.
# At the main screen (with the Install button), click the Options... button.
# Check the option "Clean Install".
# Install as usual.
===Mac OS X (versions 10.0.x and 10.1.x)===
Versions of Mac OS X prior to Mac OS X 10.2 are notoriously clean install-unfriendly. To do a clean install of the Mac OS under these system versions, proceed as follows:
# Back up the entire hard drive (or portion of the hard drive with Mac OS X on it).
# Run the installer programme from the Mac OS X Install CD.
# At the main screen (with the Install button), click Options.
# Select all options that will wipe the destination drive clean.
# Install as usual.
===Mac OS X (versions 10.2.x and above)===
To do a clean install of the Mac OS under these system versions, proceed as follows:
# Run the installer programme from the Mac OS X Install CD (CD 1).
# At the first screen (with the Install button), click Options.
# Choose the Clean Install option. You may also choose to preserve all network settings.
# Install as usual.
Category:InstallerCategory:Troubleshooting