Apple Macintosh LC 580 - Manual (Page 55)

If you are trying unsuccessfully to use a DOS floppy disk, consider the
following:
m When formatting floppy disks on a DOS computer for use in a Macintosh,
users need to format standard double-sided disks as 720K disks and high-
density disks as 1440K disks. Because DOS computers allow standard
double-sided disks to be formatted in 1440K format and high-density disks
to be formatted in 720K format, it’s possible that your disk has been given
a format that won’t work in a Macintosh.
If you think your DOS floppy disk might have a format that doesn’t work
in a Macintosh, use a DOS computer to copy the contents of your DOS
floppy disk onto another DOS floppy disk that has been properly formatted
for use in a Macintosh.
The pointer (
8
) freezes on the screen.
Your system has a software problem.
m Press x-Option-Esc to quit the application program in use when the
problem occurred. If this works, you can save the documents open in other
programs before restarting.
m Restart your Macintosh. (For instructions, see “Start Over” in the section
“When You Run Into Trouble” earlier in this chapter.) Most software
problems are temporary, and restarting usually corrects the problem.
m Check the startup disk and program you were using when the problem
occurred. Make sure that all programs, desk accessories, and system
extensions you’re using are compatible with the system software.
m Sometimes incompatible system extensions or control panels can cause
system software problems. Restart while holding down the Shift key; this
temporarily turns off all system extensions. If your computer works
normally after you do this, remove all extensions from the Extensions
folder (inside the System Folder) and put them back into the Extensions
folder one at a time. Restart after you add each extension. This procedure
should identify any incompatible extensions.
You can also use the Extensions Manager control panel to turn off
individual extensions. For information on using this control panel to
manage system extensions, see the “Setting Options” topic of Macintosh
Guide, available in the Guide (h) menu.
m If the problem recurs, you may need to reinstall system software. See
“Installing or Reinstalling System Software” later in this chapter for
instructions.
47 Troubleshooting