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m Check the ID numbers of all SCSI equipment (anything connected to the
SCSI port [g]) connected to your computer. Each SCSI device must have
its own unique ID number. If your computer came with the optional
CD-ROM drive installed, it has SCSI ID number 3, and the computer itself
has SCSI ID number 7. Therefore, any SCSI equipment you connect should
not use ID numbers 3 or 7. See the manuals that came with your SCSI
equipment, in conjunction with Chapter 3 in this manual, for information
on setting SCSI ID numbers.
m If the hard disk is your startup disk, start your computer with the Macintosh
Performa CD: Performa Software. Do this by inserting the CD-ROM disc
into the CD-ROM drive and holding down the C key while you restart the
computer. (See the section “Starting Up From the Macintosh Performa CD:
Performa Software” later in this chapter if you need more help.) Then
follow the instructions in “Repairing a Damaged Disk” later in this chapter
to test your startup hard disk and repair any damage.
If repairing the disk doesn’t help, follow the instructions in Chapter 7,
“Reinstalling Your Computer’s Software,” to reinstall system software on
your startup hard disk.
Icons do not appear correctly on your screen.
You need to rebuild the desktop—a process that helps your Macintosh keep
track of files and folders on your hard disk. For instructions, see “Rebuild
Your Desktop” in the section “If You Have Trouble” earlier in this chapter.
If icons do not appear correctly after you rebuild the desktop, try rebuilding a
second time.
Your Macintosh can’t read a floppy disk.
If you see a message that a floppy disk is unreadable, try one of the following:
m If the disk has never been used, you may simply need to initialize it—that
is, prepare it for use. For instructions, see the “Disks” topic of Macintosh
Guide, available in the Guide (h) menu.
m The disk may be damaged. See “Repairing a Damaged Disk” later in this
chapter for information on testing and repairing disks.
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Chapter 6