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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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iMac unable to restart after trying all solution...pls help me.

Hi All,

Pls kindly help me as i’ve ran out of solution as to what i need to do with my imac.

Problem: My imac will go into shutdown mode when i restart my iMac. I am not able to boot up my imac despite pressing on the power button for more than 20s. The only way it would boot up is when i pull out the power cord at the back for more than 30s and wait 5s to turn on the power supply. When it boots, it takes some time before it comes to the login screen. I’ve done a PRAM reset using option + Command + P + R and done disk utility repair and reload my Big Sur OS. The fan goes on when it boots. I have also more than 1GB disk space left and more than 10gb ram unused on my memory.

I sent it to the 3rd party repair shop who specialise in Apple products. They have done quite a few tests and they said there is nothing wrong with my power supply as the LED lights on the power supply board are on and motherboard seems fine too. There is just no power going to the harddisk.

What else can i do? Is it PRAM battery issue? Hard disk need replacement? or is it OS or software issue?

Hope you all who experience this can shed some light to my problem. Thank u!

Answered! View the answer I have this problem too

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I've done it all. After speaking to Apple support team. I have a software issue caused by Big Sur after the installation. So, i have to erase the entire HD and reinstall OS again.

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The power supply feeds power to the logic board, hard drive and DVD drive separably. I would replace it at this point as the diagnostic lights do not include the hard drive. To test this out, disconnect the internal hard drive, boot from an external drive and if it works, you have isolated the problem.

iMac Intel 27" Retina 5K Display Power Supply Replacement

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