6-8
User’s Guide
Troubleshooting
6
• If none of these steps solves the problem, you may need to
reset your computer’s parameter RAM (PRAM). Reset
PRAM by powering off the computer and disconnecting all
external SCSI devices. Next, restart the computer while
holding down the key combination
Z
-Option-p-r. Wait for
the second startup chime, then release the keys. (Note that
the “Caps Lock” key must be in the up position. This
procedure won’t work with the uppercase “P” and “R”
keys.)
The computer does not start up from the hard disk.
Try the following:
• If the hard disk is internal, power down your computer, wait
at least 10 seconds, and then power it on again.
• If the startup hard disk is external, make sure that it is
powered on and that its cable is connected firmly; then
restart the computer.
• Check the ID numbers of all SCSI equipment connected to
your computer. Each SCSI device must have its own unique
ID number. See the manuals that came with your SCSI
equipment for information on setting SCSI ID numbers.
• Start your computer using the CD-ROM disc that contains
system software. (For instructions on how to start up your
computer from the CD-ROM disc, see Starting up from a CD-
ROM disc on page 6-45.) Follow the instructions in Testing
and repairing a damaged disk on page 6-37 to test your startup
hard disk and repair any damage.
If repairing the disk does not help, follow the instructions in
Installing or reinstalling system software on page 6-48 to
reinstall system software on your startup hard disk.
