Mac Won't Shut Down

Finding the exact reasons causing issues whenever you try to shut down your Mac system may not be an easy process, as there are numerous different causes for this problem. One of the more simple ones is to check for any applications that have failed to quit. Usually, if such an application is preventing the Mac from shutting down, it will result in a dialog box stating exactly that. Another symptom is if any of the application icons on the Dock is bouncing. Also, check if any of the icons have a dot underneath them as that would mean that the application is still open. Right-click on any such applications and choose either Quit or Force Quit. To forcibly shut down the whole system, press the power button and keep holding it until the screen goes black.

To fix persistent issues with the way your Mac shuts down, you may want to check if File Vault is turned off. Start by going to the Apple menu and selecting 'System Preferences.' Open the 'Security & Privacy' pane and then go to the 'File Vault' tab. Press 'Turn File Vault off.'

It is also worth a try to repair your startup disk. For this, you will need to launch Disk Utility by going to your Applications folder and then opening Utilities. In Disk Utility, click on your startup volume and choose the 'First Aid' tab. Click the 'Run' button and see if the issue will be fixed after the process completes.