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Model A1419 / EMC 2806 / Late 2014 or Mid 2015. 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (ID iMac15,1); EMC 2834 late 2015 / 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (iMac17,1) All with Retina 5K displays

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My computer won’t turn on at all after being unplugged and moved

This is a reoccurring issue I have had since owning the computer in late 2015. It works fine if I can get it to turn on. The past 3 or 4 times I’ve had to unplug and move it I have been able to get it to turn on by tapping the back near the power cord. After it turns on once it restarts and reboots fine until I need to unplug and move it again. I just moved and haven’t been able to get it to turn on this time. I’ve never found anything about an issue like this online and I have no idea what is wrong with it.

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Take a look at the metal prongs on the plug of the electrical cord. Are they straight and untarnished? A charging cord with damaged prongs may need replacing.

Check the cord/power supply interface. Is the cord’s connection to the power supply firm and stable?

If all this checks out, then getting a new cord or power supply may fix the issue. I would try a new charging cord first since it would be less expensive.

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Before after getting the system to turn back on did you need to reset the date and time?

If the answer is yes, then you have a simple issue! Your CMOS battery has failed! It’s a rare thing as when you have your system plugged in the power cord offers phantom power to your system to keep the settings and the clock running. So when you unplug the system for a duration the battery keeps things going.

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Sadly, it’s on the back side of the logic board so its not easy to get to iMac Intel 27" Retina 5K Display Logic Board Replacement

The other possibility is the power supply got damaged by a power surge iMac Intel 27" Retina 5K Display Power Supply Replacement

iMac Intel 27" Retina 5K Display Logic Board Görseli

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iMac Intel 27" Retina 5K Display Logic Board Replacement

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iMac Intel 27" Retina 5K Display Power Supply Görseli

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iMac Intel 27" Retina 5K Display Power Supply Replacement

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1 - 2 hours

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