Apple PowerBook (2400c) - Manual (Page 113)

12 Click Install.
13 Follow the instructions that appear on the screen.
14 When you see a message reporting that the installation was successful, click Restart.
If, after reinstalling system software by doing a normal installation, you still
experience problems with your computer, follow the steps in the next section
for doing a “clean” installation of system software.
IMPORTANT Certain system extensions or application programs that were
originally on your hard disk may not be installed with the Installer program.
If you notice that a certain extension or program was not installed, you may
need to install it separately. You can find these additional extensions and
programs on the CD that came with your computer.
Doing a clean installation
The steps in this section outline what is commonly called a “clean”
installation of system software. A clean installation allows you to discover
which item in your System Folder is causing a problem. A clean installation
creates a brand new System Folder and saves everything in your original
System Folder in a different location. You can then follow the instructions in
“Replacing Special Software,” next, to reinstall system extensions, control
panels, and other special software one at a time from the old System Folder to
the new System Folder. This procedure allows you to determine which item
in the old System Folder was the source of the problem.
Do a clean installation if you can’t determine what is damaged in your System
Folder (especially if you think any special software, such as control panels,
system extensions, or custom utilities, may be causing the problems you’re
experiencing). You should also do a clean installation if you’re still having
problems with your computer after you’ve reinstalled system software by
doing a normal installation.
113 Diagnostic Techniques