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1 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.
por Dan