mSometimes 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.
mThe application program may already be open. Check the Applications menu to see which programs are running.
mThere 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.
mIf 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.)
mThe program may be damaged, or it may not be compatible with PowerPC technology. Check to make sure the software is
mCheck 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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