Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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Where can I find the diagnostic LEDs on first iMac Intel?

I have searched for the answer to this question for about 40 minutes. There are plenty of people talking about the diagnostic LEDs, but I can't find a guide or answer on how to locate them.

I've seen answers that say they are near the RAM, but that isn't for my exact model. Also, the only guide is for iMac G5... mine is an iMac EMC 2133.

Thank you for your help.

Beantwoord! View the answer Dit probleem heb ik ook

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What are the last 3 characters of your serial number, please? We can determine your exact machine with those and better address your question(s). Also please tell us more about the problem you are having.


The last 3 of my serial is X85. Is there that much of a difference in LED placement within the same model?


Apple iMac "Core 2 Duo" 2.0 20-Inch (Al) Specs

Identifiers: Mid-2007 - MA876LL - iMac7,1 - A1224 - 2133


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Here's Apples Service Source manual on your machine. Page 204 shows the location of the diagnostic LEDs:

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The LED's are on the logic board to the right of the RAM slots and between the RAM slot and the HDD sata connector

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.

Block Image

Pic is from the 19th December 2007 ed.

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This does not appear to be the correct logic board but the LED descriptions are correct.


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Hi there , inhave a imac 20" a1224 and the problem is that my lcd led stopped working. I checked the inside led's next to the cable and all 4 of them are on.. when the pc is startig the first 3 are working from left to right . And after the pc is fully loaded all 4 are working. Help pls ?

Should i change the lcd ? :(

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Petey zal eeuwig dankbaar zijn.

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