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Model A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5 or 3.8 GHz Core i5 or 4.2 GHz Core i7 Kaby Lake Processor (ID iMac18,3) / Retina 5K display. Refer to the older iMac Intel 27" Retina 5K Display (Late 2014 & 2015) guides as the system is very similar.

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iMac won't power on after plugging in USB charger

I’ve had this iMac since 2017 and I’ve never had a problem with it. A few days ago I plugged my fitbit charger into the USB port and the entire computer died.

I tried all the the simple fixes I could find (reset SMC chip/taking out power cable/trying a new power cable etc) and nothing worked.

After running out of options, I removed the screen and checked the diagnostic lights. Only the first LED lit up when trying to power it on. So I replaced the power supply hoping that would fix it, but I still have the exact same problem. Only the first diagnostic LED lights up.

I’m hoping some people smarter than me can give me some suggestions on what might be wrong.

Thanks for your time!

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You mean you plugged in the charging cable for your FitBit, correct? Not the AC unit.

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@danj Yes, my computer was powered on and I plugged my FitBit charger into the USB port and my computer has been dead ever since.

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@matthaeus Cable or AC unit they are different!

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@danj My apologies, I meant the cable.

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OK, so you didn’t force power into your system via the USB port. But the USB port connector could be damaged I would inspect them to see if any of the pins are folded pack hitting the shield area (sorting out).

The act of plugging in a cable on its own wouldn’t otherwise hurt your system.

So I think if the connectors are OK we need to look at other directions. Clearly you have a sort condition somewhere within the logic board likely a blown capacitor. Carefully inspect the board using a magnifier looking for a blistered component or staining on both sides of the logic board.

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