![]() You may run into this problem even after macOS Sierra 10.12 and macOS High Sierra 10.13, but know that you will be able to apply this method again if that happens. Type in your password and you're back in business. That's normal, even if you previously bypassed it. You will have to press the Enter/Return key after each one. You then need to type the following commands: Then, quickly press the Command and S keys, to get you into the single-user mode.) Hit the Command, Option, P and R keys at the same time, right after you power it on, and wait until you hear the startup chime for the third time before letting go. (I've seen someone recommend that you reset the PRAM three times before booting in the single-user mode. If you did it right, you should see a whole bunch of lines on the screen in what is a Terminal-like interface. That's done by pressing the Command and S keys at the same time, right after pressing the power key. Next, you have to boot your Mac in single-user mode. Pressing the power key for a couple of seconds will do the trick. ![]() ![]() First, you need to shut down your Mac, if it's powered on. ![]() Step ii) From the macOS Utilities window, select Reinstall macOS, and press Continue. Steps are as follows: Step i) Restart the MacBook Pro and press-hold Command + R keys until the Apple logo appears. As a last resort, back up your Mac then reinstall macOS to fix MacBook Pro booting issues. You can try to reboot or reset the PRAM and SMC - the first things that Mac users can try when something isn't working right - but that will not fix it. Reinstall macOS Using macOS Recovery Mode. It is not clear what exactly is causing macOS to act up after installing an update, but it rears its ugly head after powering on the Mac.
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