stuck on progress bar
how to restart once stuck on progress bar
iMac 27″, macOS 11.6
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If you think you've waited long enough to know that your Mac is stuck on this screen, follow these steps.
- Press and hold the power button on your Mac for up to 10 seconds, until your Mac turns off. (Every Mac has a power button. On notebook computers that have Touch ID, press and hold Touch ID.)
- Turn your Mac back on. If the issue persists, press and hold the power button until your Mac turns off. Then unplug all accessories from your Mac, including printers, drives, USB hubs, and other nonessential devices. You could have an issue with one or more of those devices or their cables.
- Turn your Mac back on. If the issue persists, once again press and hold the power button until your Mac turns off. Then follow the steps in this article: How to repair a Mac disk with Disk Utility. It explains how to start up from macOS Recovery so that you can use Disk Utility.
- If Disk Utility found no errors, reinstall macOS.
- If Disk Utility found errors and repaired them, restart your Mac. If the issue returns after restarting, reinstall macOS.
If you still need help, please contact Apple Support.
See this link for further reference
If your Mac starts up to an Apple logo or progress bar - Apple Support