Apple IMAC User Manual - Page 93
Resetting the Logic Board, General/ Resetting the Logic Board - 1 1
UPC - 067540444435
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Troubleshooting General/ Resetting the Logic Board - 1 1 Resetting the Logic Board Resetting the logic board can resolve many system problems (see the Symptom/Cure tables for examples). Whenever you have a unit that fails to power up, you should follow this procedure before replacing any modules. 1. Unplug the computer. 2. Disconnect the cable that runs from the power supply to the power filter board on the bottom side of the logic board/mass storage chassis. 3. Press the Power On button on the front of the unit. 4. Remove the logic board/mass storage chassis from the unit. 5. Remove the battery from the logic board. 6. Wait at least 10 minutes before replacing the battery. 7. Make sure the battery is installed in the correct +/direction. 8. Reassemble the computer and test the unit. Note: This procedure resets the computer's PRAM. Be sure to check the computer's time/date and other system parameter settings afterwards.