Apple Power Macintosh 7200 - Manual (Page 99)

Repairing a damaged disk
Disks can become damaged by repeated use and handling.
When do you need to repair a disk?
If you see a message reporting that a disk is damaged or unreadable, you may
need to repair the disk.
Try these suggestions first
If you can’t start up from a hard disk or you don’t see the hard disk icon on the
desktop, try the following:
m If the hard disk is internal, shut down your Macintosh, wait at least 10
seconds, and then turn it on again.
m If the hard disk is external, make sure that it is turned on and that its cable
is connected firmly; then restart the Macintosh.
m If the hard disk is your startup disk, start up with a different startup disk. If
the hard disk’s icon appears on your desktop, reinstall system software on
the hard disk. See “Installing or Reinstalling System Software” later in this
chapter.
m Check the ID numbers of all SCSI equipment connected to your computer.
All devices on the same SCSI chain must have unique ID numbers. The
computer itself has the ID number 7, and the factory-installed hard disk
has the number 0. If your computer came with a CD-ROM drive installed,
it is also connected to the SCSI chain and has ID number 3. Other SCSI
devices connected to the chain can have ID numbers 1, 2, 4, 5, and 6.
99 Troubleshooting