Apple Macintosh PowerBook 1400 - Manual (Page 120)

Reinstalling the Mac OS system software
When should you install system software?
Your computer came with all the necessary Mac OS system software installed
on its internal hard disk, so you don’t need to install system software on that
disk unless you encounter software problems.
If you have a new hard disk or a newly initialized hard disk that doesn’t
contain system software, or if you want to upgrade to a more recent version of
system software on a hard disk, follow the instructions in “Doing a Normal
Installation” later in this chapter.
If you have a problem with your system software, you may see this icon in the
middle of the screen:
If this icon appears, follow the instructions in “Testing Your Hard Disk”
earlier in this chapter to test your startup hard disk and repair any damage.
If repairing the disk doesn’t help, follow the instructions in “Doing a Normal
Installation” to reinstall system software on your startup hard disk.
What if you don’t have system software disks?
Appendix D, “Making Backup Floppy Disks,” describes how to make a set of
system software disks in case your hard disk or some of its contents are
damaged. If you cannot start up your PowerBook from its hard disk, start it
up with the Disk Tools disk that came with your computer. Then follow the
instructions in Appendix D to make a set of system software disks.
If your PowerBook includes a CD-ROM drive or you have an external
CD-ROM drive, you don’t have to make a set of system software disks; you
can reinstall the complete system software (as well as the programs that were
preinstalled on your hard disk) from the CD.
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