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When to Do It:

  • Whenever control panel settings, such as the current date/time and volume level, are inexplicably incorrect (especially if, after you reset these values, the settings are wrong the next time you turn on your Macintosh).

  • If your Mac starts up in Black-and-White or Grayscale, even though you have selected Color from the Monitors control panel.

  • Whenever you are unable to start up from a hard drive, especially an external hard drive. Symptoms as serious as a Sad Mac may occur.

  • If you cannot mount or otherwise access any externally connected SCSI, USB, or FireWire device.

  • Whenever you cannot access a modem or other serial port device because its port is claimed to be in use.

  • When you cannot get documents to print at all or if garbage characters print instead of the correct output, especially if an error message appears indicating a problem with the serial port.

  • If, in certain PowerBook models, you lose sound from your speakers.

  • If a monitor's screen does not come on at startup.

  • If, after you select Shut Down from the Finder's Special menu, the Macintosh restarts instead of shutting down.

  • If you get persistent and frequent system errors at random times.


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