The full name of SMC is System Management Controller. If your Mac is still stuck on the loading screen, you can reset SMC to have a try. Your Mac will restart about 20 seconds later and the PRAM/NVRAM resetting process will end.Press the Power button and immediately press and hold the Option, Command, P, and R keys at the same time.Press the Power button for seconds to force shut down your Mac.Mac stuck on Apple logo is usually a startup-disk-related issue. Why? PRAM or NVRAM usually saves some settings, including sound volume, display resolution, startup disk selection, and more. Resetting PRAM/NVRAM is also a good method to solve iMac won’t boot past Apple logo. After that, you can force reboot your Mac to see whether the issue is solved. To rule out this possibility, you can unplug all third-party accessories from your Mac like printers, USB drives and hubs, headphones, etc. Third-party plugged accessories can also freeze a Mac computer. Method 3: Unplug All Third-Party Accessories from Your Mac If you are trying to install or update your macOS, you can also do the job in Safe Mode. Then, you can enter your password if necessary. You can see red Safe Mode on the upper right side of the screen. Release the Shift key when you see the login screen.10 seconds later, you can press the Power button and press & hold the Shift key at the same time.Press the Power button for a while until it shuts down completely.Besides, it can fix some issues on your Mac machine. Your Mac computer can run in a pure environment without hardware failure or other startup issues after the machine boots into Safe Mode. Read More Method 2: Use Safe Mode to Solve the Issue
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