Resetting the SMU System Management Unit

  1. Unplug all cables from the computer, including the power cord.
  2. Wait 10 seconds.
  3. Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
  4. Let go of the power button.
  5. Press the power button once more to start up your iMac G5 (20-inch iSight).


The iMac G5 (20-inch iSight) ports are shown below.

Imac Inch Ports

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  • william
    Where is the system management unit on apple?
    9 years ago

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