stuck on progress indicator

Please try the following, in order. Stop at the step where the issue is resolved:

1. Reset your Mac's SMC.
   • Reset the System Management Controller (SMC) on your Mac- Apple Support
   • Fans, keyboard backlight, status indicator, battery indicator, display backlight, power button, close/open the lid, sleep or shut down, battery doesn't charge, MagSafe indicator light incorrect status.
   • Hold down the <shift><control><option> keys, and then, press the power button. Hold all of them for, at least, 10 seconds.
2. Reset your Mac's NVRAM.
   • How to reset NVRAM on your Mac- Apple Support
   • Resets sound volume, display resolution, startup-disk selection, time zone, & kernel panic information.
   • <option><command><P><R>
3. Boot up your Mac in Safe Mode.
   • Try safe mode if your Mac doesn't finish starting up- Apple Support
   • Use safe mode to isolate issues with your Mac- Apple Support
4. Boot up your Mac in Recovery or Internet Recovery Mode.
   • About macOS Recovery- Apple Support
   • When at the initial Recovery Mode screen, select the Disk Utility option.
   • Run Disk Utility > First Aid to verify the startup disk's integrity.
5. Boot up your Mac in Single-User Mode.
   • How to start up your Mac in single-user or verbose mode- Apple Support
   • At the command prompt, type:/sbin/fsck -fy<return>

     If fsck makes any repairs, you will get a message that says: Files System was modified. If you do, run fsck again until the "The volume <volumename> appears to be OK."

   • Typerebootat the prompt to exit Single-User Mode.
6. Run Apple Diagnostics to uncover any hardware issues with your Mac.

   Use Apple Diagnostics or Apple Hardware Test- Apple Support

7. Make a Genius Bar appointment at your local Apple Store.
   • Check Your Service and Support Coverage- Apple Support
   • For getting the right support, here's a genius idea- Apple
   • To contactApple Supportdirectly.
   • You can only make 1-week ahead appointments either via the web link above or AppleCare phone support. The appointment timeframe is longer if you go in-person to an Apple Store.