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When to Do It:

  • If the Macintosh doesn't turn on at all.

  • If the Sad Mac icon appears at startup (especially if there are no F's in the code numbers below the sad Mac). This symptom is most often caused by defective memory.

  • If a Macintosh does not play a normal startup tone when you turn it on, and it subsequently refuses to start up. This is again most likely a memory problem. Alternatively, you may actually get an error message at startup describing a memory problem.

  • If you are having crashes or other similar problems that begin shortly after installing additional RAM, a SCSI card or a processor upgrade.

  • If the borders of the monitor's display image has shrunk or the display is showing other unusual symptoms, especially if they disappear if you connect the same monitor to another Mac (this often indicates a power supply problem).

  • If you have any problem with the Macintosh and you have exhausted all other possible causes, as described throughout this book.


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