iMac won't restart after macOS Monterey update

I have upadated the MacBook Pro to the new software (Monterey) and it went OK

When I did the same to iMac the problem begun.

Now I am so stuck that the computer doesn't even restart !

I keep Command + R but get no results !

What to do ?

thanks



[Re-Titled by Moderator]

iMac 27″ 5K, macOS 10.14

Posted on Oct 28, 2021 10:39 AM

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14 replies

Oct 28, 2021 11:54 AM in response to Antonio Correia

I suspect it has suffered a hardware failure. Doing major updates on computers are stressful to computers that use hard drives of some type as there are a LOT of read/write cycles that occur during the update that stress the drive. If the drive's health is marginal to begin with, the update process can push it over the edge. This can occur on aging systems , however you can attempt the following:


  1. Attempt to restart in Safe Mode per the directions in Safe Mode Reset and then try to restart normally.
  2. If #1 fails, then please hold down the power button for about 15 seconds and then release and see if it starts up.
  3. If #s 1 & 2 fail please contact your local AASP ( AASP Locator ) and book an appointment to take the computer in to be professionally diagnosed.


Good luck!

Oct 28, 2021 2:08 PM in response to Antonio Correia

With mouse and Keyboard issues, try resetting both the NVRAM and the SMC on that iMac.


Reset NVRAM or PRAM on your Mac - Apple Support

How to reset the SMC of your Mac - Apple Support


If that doesn’t resolve this and if you have the Apple wireless keyboard and mouse on that iMac, try connecting those to the iMac with the Apple USB-A to Lightning (charging) cables. That bypasses the Bluetooth path.

Oct 28, 2021 11:24 AM in response to rkaufmann87

Thank you !

In the first attempt I started pressing Command+R, followed the procedures and it stuck after apple ID with the white bar stopped at some point

On the second attempt I unplugged it for a couple of minutes and it restarts asking for the password.

I insert the password, the white bar progresses until it turns all black with the Apple and the white bar stuck

I do know the photo is terrible but I hope you can see the frozen bar at the beginning


All this because I want to update Lightroom !

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iMac won't restart after macOS Monterey update

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