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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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No power. LED 1 stays on. 2 and 3 will flash upon pressing power.

I’ve found several results on this page for similar problems but with different iMacs. This one has non-removable RAM though so RAM suggestions don’t help. LED 1 never shuts off until I unplug the system. When I press the power button 2 will light up, then 3 will light, and then both will shut off. They will continue doing this until I unplug power. It sounds to me like the logic board failure.

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Can you give us some background on what happened.

Did you check your power outlet, is it correctly wired and have a proper ground? You'll need to also check your breaker panel's ground connection too! Do you have a surge suppressor or better yet a UPS.

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Logic board was the issue.

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Taylor Campbell crwdns2934231:0crwdne2934231:0
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