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. 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. 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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