Complete the fields shown for a Standard or Administrator account, then click Create Account (or OK).

Click the Add button (+) below the list of users.

Click, then enter an administrator name and password.

Choose Apple menu () > System Preferences, then click Users & Groups.But the best way to test is with a newly created account:

If another user account is already set up on your Mac, you can simply log out of your account (Apple menu > Log Out) and log in with the other account. If the issue persists in safe mode,use the steps below to test for the issue in a new user: If you're able to shut down successfully, start your Mac up and test again from a normal boot. Use safe mode to isolate issues with your Mac If the issue doesn't come back, it was probably caused by a cache or directory issue with your startup disk, which safe mode fixed.If the issue comes back, you might have incompatible login items.If an issue doesn't happen when your Mac is started in safe mode, try restarting without pressing any keys. To leave safe mode, restart your Mac without pressing any keys during startup. If your startup disk is encrypted with FileVault, you might be asked to log in twice: once to unlock the startup disk, and again to log in to the Finder. Release the Shift key when you see the login window.If you don't see the Apple logo, learn what to do. Start or restart your Mac, then immediately press and hold the Shift key.If not, use these steps to start your Mac in safe mode and test again: First, if you haven't already, I'd recommend using the steps in the following guide to reset the System Management Controller on your Mac: How to reset the System Management Controller (SMC) on your MacĪfter performing this reset, test to see if you're able to shut down the Mac when connected to the power adapter. I know it's important to be able to shut down your Mac I'd like to help. I also see that you've taken some troubleshooting steps on your own I appreciate you including those, they're most helpful to know. I understand that when you try to shut down your Mac when it is connected to the power adapter it is restarting instead of shutting down, but when you're not using the power adapter the Mac will shut down without issue. (If you have a MacBook from 2009 or earlier with a removable battery, the SMC reset procedure is slightly different.Thanks for reaching out in Apple Support Communities. Then, press and hold Shift + Control + Option + power button simultaneously for about 10 seconds. Unplug the power cable from your Mac and plug the power cable back in. Resetting the System Management Controller may help. If the battery on your Mac notebook computer is completely dead, you may need to give your computer a few minutes to recharge on an AC outlet before the device has enough juice to power on. Look at the power connections to make sure the power source is securely plugged into your MacBook and confirm the AC outlet is working. Try to restart your Mac with these items unconnected. Disconnect any accessories that are plugged into your Mac, including printers, mobile devices, video displays, and USB cords. If the screen remains dark after you press the power button, try raising the brightness levels by pressing the buttons with icons that look like the sun located toward the left side of the keyboard on the top row of buttons (or the Touch Bar). There's a chance the display lighting level is turned way down.

My mac won t shut down