Home > Questions

MacBook Pro Won't Boot After Update, What Can I Do?

I attempted to upgrade my 2017 MacBook Pro from Big Sur to Monterey. After I downloaded Monterey and click Upgrade Now I went away. When I came back, I tried to boot up my MBP but find it won't boot. It is stuck in a loop like this: Turn on with the fan running, the Apple logo appears on the screen, the progress bar completes, black screen. I pressed CMD + R to try to boot into Recovery mode but the computer shuts down after the Apple logo.

Best Answered by

iBoysoft author Connie Yang

Connie Yang

Answered on Monday, July 10, 2023

Have you connected external devices like a USB hub and plugged different external drives into your MBP? If yes, try to disconnect them from your Mac as problematic external devices can make your MacBook won't restart after the update. Apart from faulty external devices, many other errors can also cause your Mac to take forever to restart after the update.

Here I've summarized common methods to fix your MacBook that won't boot after a macOS update:

Charge your Mac

Do you connect your MacBook to a power source during macOS updating? Your MacBook may don't have enough power to enable the machine to fully restart, so it goes into a loop between restarting and shutting down.
You can charge your Mac for a period and then check if it can be restarted.

Reset SMC

SMC manages battery and other low-level settings. When your Mac won't restart after updating to Monterey, resetting SMC may help you out of the dilemma.


Resetting NVRAM is also a noteworthy workaround as NVRAM stores startup disk selection and other settings related to Mac startup.

Boot into Internet Recovery Mode

As you described, you can't boot your Mac in Recovery Mode by pressing Cmd + R. You can try to enter Internet Recovery Mode by pressing Cmd + R + Option/Alt shortcuts and the power button. The precondition is you should ensure your Mac connects to the internet.

After getting into macOS Recovery Mode, run First Aid to check the Mac hard drive:

  1. Click Disk Utility.
  2. Select the startup disk from the left sidebar.
  3. Click First Aid > Run.

Then, click the Apple icon > Restart to check if your Mac can be restarted. If still not, reboot into Internet Recovery Mode and choose Reinstall macOS to let your Mac reinstall the system again.

People Also Ask

Read More Questions

Read More Advice From iBoysoft's Computer Experts

Photolibraryd high CPU usage on Mac

What is Photolibraryd on Mac|Fix Photolibraryd High CPU

Here's what photolibraryd is and how to fix photolibraryd high CPU usage, draining battery and quitting unexpectedly on Mac.

Wiki Tips


Stop 'com.apple.DiskManagement.disenter error 49221' on Mac

Do you receive the message saying 'com.apple.DiskManagement.disenter error 49221' when mounting a disk in Disk Utility manually? If you do, this article right here comes to help you out of trouble.

mac put hard disks to sleep when possible