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The steps to reset the NVRAM and PRAM are the same. If these stored settings have issues, resetting might help.

PRAM (Parameter RAM) stores similar information. This section could help macOS access them quickly. NVRAM (non-volatile random-access memory) is a small amount of memory in Mac that stores certain settings. Click The First Aid icon then click the Run button.Choose Disk Utility and click Continue.Note: You may be asked to select your language before you get to the recovery option. Release the keys when you see the Apple logo and you’ll see the “macOS Utilities” window.Restart your MacBook and hold the Command + R keys together immediately.Also, the stuck-on loading screen issue could be related to disk corruption. Recovery mode also could help you troubleshoot the problem on your MacBook. Your MacBook should restart normally afterward. Release the Shift key when you see the Apple logo on the screen, then log in.Restart your MacBook and hold the Shift key immediately.Shut down your Mac by pressing the Power button.So booting up your MacBook in Safe Mode could help you fix the problem that causes your computer stuck on the loading screen. Safe Mode in macOS is designed to help users troubleshoot issues related to their computer. Pressing Shift+ Control + Option+ the Power keys at the same time and hold them for about 10 seconds.If the issue is related to the stored settings, resetting SMC could help you fix the problem. The SMC (System Management Controller) is a place to store certain settings. Bonus: How to recover and back up the data.