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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 (in the Control Panels folder in the Apple [K]
menu) to turn on extensions and control panels one at a time. Restart after
you turn on each extension and control panel. This procedure should
identify incompatible extensions and control panels. (If you just added new
software to your computer, its system extension is the most probable cause
of the problem.) For detailed instructions, see the information about
managing system extensions in Macintosh Guide (or Mac OS Guide),
available in the Guide (h) menu.
If your computer performs better when a particular extension or control
panel is turned off, contact the software’s manufacturer for information or
an upgrade.
A program won’t open.
m The application program may already be open. Check the Applications
menu to see which programs are running.
m There may not be enough memory available to open the program. Quit any
programs you’re not using and try again. If that doesn’t work, try restarting
the computer.
m If the program is on a floppy disk, make sure the disk is unlocked. (You
unlock a disk by sliding the tab at the corner of the disk so that it covers
the hole.)
m The program may be damaged, or it may not be compatible with PowerPC
technology. Check to make sure the software is PowerPC-compatible, and
install it from a known good source (such as the original program disks).
m Check that the program is compatible with the version of system software
that you are using. (See the program’s documentation, or contact the
manufacturer or vendor.)
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Chapter 10