Apple Macintosh PowerBook 1400 - Manual (Page 129)

Doing a clean installation
This section provides instructions for what is commonly called a “clean”
installation of system software.
A normal system software installation replaces changed system files and adds
new ones, but leaves other files alone. When you install system software using
a “clean” installation, the Installer creates a new System Folder on your hard
disk. The old System Folder is renamed Previous System Folder. Since your
computer has a new System Folder, you must reinstall any extensions and
control panels that you added or that came with utility or application
programs. This can be a complicated procedure, but if you are experiencing
problems or your computer seems slow, performing a clean installation may
help.
Follow these steps to begin your clean installation.
1 Follow the instructions in the first three sections of “Doing a Normal Installation” earlier
in this chapter.
You should have completed the first three steps indicated in the main Install
Mac OS screen.
2 Click the fourth button on the main Install Mac OS screen.
129 Diagnostic Techniques