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A1418 | EMC 2889 | Late 2015 | 1.6 GHz dual-core Intel Core i5 or 2.8 GHz quad-core Intel Core i5. Released October 13, 2015.

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What does blinking LEDs 1 and 2 mean?

iMac 21.5” does not power up, no chime is heard. I know that LED codes are: LED 1 on= trickle voltage from power supply is detected by logicboard. LED2 on= logic board has detected proper power from the power supply when the computer is turned on.

The problem is BOTH LEDs 1 and 2 are BLINKING (not ON continuously) when I connect the AC power cable to the mains wall socket. What problem does this point to?

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Can you offer some additional details on what preceded things here.


Nothing unusual happened prior to. Thing just suddenly won't turn on.


Where is the light coming from?


Light comes from the vertically arranged LED array on the logicboard.


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What does the other LED’s telling you?

Block Image

Did you try reseating the RAM? Did you replace the RAM you might have a bad SO-DIMM.

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The RAM is permanently soldered to the logicboard in this model, and cannot be replaced.


Dan, when I press the power button, the 2 other LEDs remain unlit, #1 and #2 LEDs turn off. When I release the power button, LEDs #3 and 4 remain off and #1 and #2 start to blink again.


@Bernie - Sorry your right! One of the few iMacs with soldered RAM.

I think your logic board is blown then.


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Bernie sera éternellement reconnaissant.
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