Apple Mac Performa 640 series - Manual (Page 97)

A dialog box with a bomb appears.
Your system has a software problem.
m Note what you were doing when the message appeared, and write down
the text of the message.
m Restart your Macintosh. (See “Start Over” in the section “If You Have
Trouble” earlier in this chapter for instructions.) Most software problems
are temporary, and restarting usually corrects the problem.
m If the problem recurs, check the startup disk and application program you
were using when the dialog box appeared. Make sure that all programs,
desk accessories, and system extensions you’re using are compatible with
the system software. Reinstalling the system software or the program may
correct the problem.
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, use the Extensions Manager control panel to
turn on extensions and control panels one at a time. Restart after you turn
on each extension. This procedure should identify incompatible extensions
and control panels.
For information on using the Extensions Manager 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 the
Macintosh Performa CD booklet for instructions.
89 Troubleshooting in the Macintosh Environment