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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 Check the ID numbers of all SCSI equipment connected to your computer.
See the manuals that came with your SCSI equipment for information on
setting SCSI ID numbers.
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 still do not appear correctly after you rebuild the desktop, restart your
computer while pressing the Shift key to temporarily turn off system
extensions. When you see the “Welcome to Macintosh—extensions off”
message, release the Shift key and press the Option and x keys until you see a
message asking if you want to rebuild the desktop.
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. 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.
m The disk may have been formatted for use on another kind of computer.
You may be able to use a program that lets you work with such disks on
your Macintosh. If you are using a DOS disk, for example, make sure the
PC Exchange control panel exists in the Control Panels folder (in the
System Folder) and that it is enabled. To enable PC Exchange, open the
Extensions Manager control panel and click the PC Exchange item (under
the “Control Panels” heading) to make a check mark appear before it.
m If the disk is a high-density disk previously used on another computer, the
disk may have been formatted incorrectly as an 800K disk rather than as a
1440K (high-density) disk. If so, use the other computer to copy the disk’s
contents onto a properly formatted disk.
77
Troubleshooting