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Call it bad luck i guess. When dusting my office desk i slid the imac and the lightning cable that is plugged into the rear ports landed on a 110 outlet where another device was plugged in. The device was not plugged in all the way and the end of the lighting cable landed righ on those pins. There was a spark at the 110 plug and the breaker kicked. The usb cord only had a bad spot where it made contact. Outside of that it was fine. I have tried powering back up my imac but there is nothing. My question is do you think it killed the logic board? Power supply? I assumed logic board since the usb ports are connected to it. The logic boards for my model are almost as much as a new machine. Any advice? Update (01/31/2020) I took the screen off and am only getting one green LED. Just as suspected PS is fine. Logic boards for my model when i can find them are almost as muc has a new computer. I am leaning towards a used IMac, one just like mine. They are in the 650 range. Any ideas?
You’ll need to open it and observe the Diagnostic LEDs on the logic board. This guide will get you there.: iMac Intel 21.5" Retina 4K Display (2017) Logic Board Replacement Meanwhile try plugging it into another wall outlet than the one you are currently using. Also try resetting the PRAM by holding down the p, r, option and command keys on start up and see if you can get it to give you a POST tone.
