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The computer makes an unusual sound at startup.
m If you hear four tones, start up the computer with the Disk Tools disk that
came with your computer. If the computer does not start up, or if the hard
disk icon does not appear, the hard disk may need repair. Contact an
Apple-authorized service provider or call the Apple Assistance Center. If
the hard disk icon does appear, see Chapter 8.
m There may be a problem with the information stored in the area called
parameter RAM (PRAM). Reset the PRAM (also called “zapping the
PRAM”).
Resetting the PRAM erases the contents of your RAM disk, if you have
one. Resetting the PRAM also restores the default settings in most control
panels. After you reset the PRAM, be sure to check any custom settings
you made for the desktop pattern, memory, network, AppleTalk, trackpad,
power conservation, and so forth. Resetting the PRAM also resets the
power manager.
Follow these steps to reset the PRAM:
1. Locate the keys Command (x), Option, P, and R.
2. Make sure the Caps Lock key is not down.
3. Restart your Macintosh. Immediately after hearing the startup sound,
press the Command (x), Option, P, and R keys simultaneously.
If you don’t hold down the key combination within 5–10 seconds after
you restart, you may need to repeat steps 1–3.
4. Hold down the keys until you hear the startup sound repeat itself three
times. Then release the keys.
5. If the computer shuts itself off, press the Power key to turn it back on.
6. When the computer has finished starting up, restore any custom control
panel and network settings.
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Tips and Troubleshooting