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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.

47 Questions View all

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?

Answer this question I have this problem too

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4 Comments:

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

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

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Where is the light coming from?

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

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1 Answer

What does the other LED’s telling you?

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

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3 Comments:

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

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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.

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@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 will be eternally grateful.
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