iMac 2017 T2Chip failure

So I just recently tried to update my Mac from Mac os Monterey to Sonoma everything was going fine until it was installing and my screen shut off and didn't reboot, after that I got a bit concerned waited a bit maybe for it to finish but nothing ended up happening, I unplugged my iMac from the wall and plugged it back in pressed the power button and nothing happened I heard the fans come on but no startup sound and the screen was black, later on come to find out this has something to do with the t2 chip and what the update does to it, I ran though process with Apple configurator2 trying to revive but it still didn't fix anything so I took drastic measures and tried to restore and wipe all the data, the screen came back on with the Apple logo but now never fully booted to anything now it's back at when I press the power button I only hear the fans and the screen doesn't come on and now all my data is gone as well, very upset to have lost everything and now have a non functioning iMac, If anyone knows a solution, please help.

iMac Pro

Posted on Mar 5, 2025 6:42 PM

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Mar 5, 2025 6:48 PM in response to iMac2017T2Chipfailure

" I got a bit concerned waited a bit maybe for it to fish but nothing ended up happening, I unplugged my iMac from the wall and plugged it back in"


The absolute worst thing to EVER do when a computer is in the process of updating. You may have corrupted your internal storage completely. The link below may help.


How to start up from macOS Recovery - Apple Support


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Mar 5, 2025 10:46 PM in response to lkrupp

It won't boot to recovery or anything visually, I turn it on an can hear the fan going but that's about it, I wouldn't be so worried if the screen would work and have some responsiveness, this is 100% a software problem I just am not sure what else to try

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Mar 6, 2025 5:54 AM in response to iMac2017T2Chipfailure

Since you have decided this is 100% a software problem I guess that’s it. Why does your original post say the T2 chip failed then.


I see no other option than to take your iMac in to an Apple Store or authorized Apple service provider for inspection and diagnosis. If your iMac no longer has any active warranty then you might also consider a third party repair shop.

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iMac 2017 T2Chip failure

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