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iMac G5, 17-inch Troubleshooting General Information
7. Locate the large white arrow in the middle of the board.
8. Above this arrow, you'll see four LEDs:
•
LED 1
indicates that the trickle voltage from the power supply has been detected
by the main logic board. This LED will remain ON whenever the iMac G5 is
connected to a working AC power source. The LED will remain on even when the
computer has been shut down or put to sleep. The LED will turn off only if the AC
power source is disconnected or the power supply is faulty.