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iMac (17-inch Mid 2006/Late 2006 CD) Troubleshooting — General Info 126
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 (Mid 2006 17-inch) 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 o only if the AC power source is disconnected or the
power supply is faulty.
LED #2
Indicates that the main logic board has detected proper power from the power supply when
the computer is turned on. This LED will be ON when the computer is turned on and the
power supply is working correctly.
LED #3
Indicates that the computer and the LCD display are communicating. This LED will be ON
when the computer is turned on and video signal is being generated.
Front LED
Indicates that the computer has power but no video signal (e.g., the computer is starting up
or the display has entered Sleep mode, turning o the video signal). This LED will pulse when
the entire system has entered Energy Saver mode.
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