Apple Macintosh PowerBook 190 Series - Manual (Page 125)

IMPORTANT Certain additional system extensions or application programs that
were originally on your hard disk may not be installed with the system
software 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 in the disk images that come on your
computer’s hard disk. (You can make installer disks for these programs with
the Floppy Disk Maker application program.)
Doing a clean installation of system software
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. After doing a clean installation, you can
then follow the instructions in “Replacing Special Software” 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.
To do a clean installation, follow these steps:
1 Start up your computer from the Disk Tools disk .
2 Find and open the Disk First Aid icon.
After Disk First Aid starts, follow the instructions on the screen. Disk First
Aid checks your hard disk for any problems.
118 Chapter 8