I was able to take my imac apart but i wasnt able to see any of the LEDs on the PSU. Do I need to remove the PSU from the imac to see that? Can someone point me to where there is a document that shows how to identify and use the LEDs to troubleshoot.
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Diagnostic LEDs
The iMac (20-inch 2007) has four built-in diagnostic LEDs on the main logic board that can help you to troubleshoot the computer. The four LEDs are located to the right of the memory slot, under the hard drive data cable.
It may be necessary to carefully remove the hard drive data cable to view the 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 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.
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 video card are communicating. This LED will be ON • when the computer is communicating properly with the video card. If LEDs 1 and 2 are ON and you heard the startup sound, but LED 3 is OFF, then the video card might be installed incorrectly or need replacement.
LED #4
Indicates that the computer and the LCD display panel are communicating. This LED will be • ON when the computer is turned on and video signal is being generated. If the LED is ON and there is no image on the LCD display panel, the LCD display panel or inverter might be installed incorrectly or need replacement.
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It's been a while since I opened one, but there were about 4 LEDs all together in a little strip at the bottom of the logic board. You don't need to remove the board to see them. They are at the bottom in the middle.
- de Jonathan