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A2115 / 2019 / Processeurs à partir de 3,0 GHz 6 cœurs i5, jusqu'à 3,6 GHz 8 cœurs i9. Commercialisé le 19 mars 2019.

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My iMac wouldn't turn on after Failed Software Update

I own an iMac with an OS below Catalina. 2 days ago, There was an unwanted shut down by the desktop being unplugged while the computer was restarting in an attempt to download the OS. The screen was black with an Apple Logo like when you wanna start it but after being forcefully unplugged, it won’t turn back on.

i read somewhere that mac OS has a mechanism of shutting their system off for 3 days after these kinds of forceful shutdowns. It has only been 2 days now but i’m scared that something else is causing my iMac not being able to start. Does anyone ever have the same problem and has solved it?

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There is no magical reset timer, so the system resets its self after three days.

What I think you are getting confused on is the fact SMC will latch the system in a failed state when a serious hardware defect is encountered. This is designed to prevent you fram causing more harm to your system.

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OK, let’s clear the latch to see if what you did messed it up. Disconnect the AC power cord, press and hold the power button with nothing connected for a good 15 sec. That should reset SMC (I prefer this method than Apples)

Here’s more on resetting SMC How to reset the SMC of your Mac

I fear you may have messed up your system by disconnecting the power cord in the middle of a write operation so your drive maybe corrupted! Unlike the older systems your’s has a T2 chip which encrypts your flash storage.

I hope you have a good backup as the two times I faced this I had to reformat and install a fresh OS to the drive to get the system running again.

Make sure you properly shut down your system before you disconnect the power cord. You may want to invest in a good UPS so if your power goes out you have time to do a proper shutdown (you can even automate this).

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Hello Dan, thank you so much for answering!

may i ask what do i expect after resetting the SMC? Do i try to turn it back on normally? And how do i reformat and install a fresh OS when the mac itself isn’t on? Do i have to take my mac to the Apple’s service?

thank you

par

I thought only the 2020 27" iMacs got the T2 chip?

par

@ngs765 - Your right! Some how I had in my mind it was a 2020 model.

Still doesn't change much here if the system won't turn on.

par

@netflix Bersama - Yes plug your system in again to power and restart it. It should restart, did it? Did you get any signs of life?

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Sadly it didn't restart :( it stayed the same, there's really no signs of life

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netflix Bersama sera éternellement reconnaissant.
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