

If you don’t try it now, don’t forget later on. In some cases, problems vanish after resetting the SMC and NVRAM, a quick and simple procedure which is worth trying sooner rather than later. If macOS does really seem messed up, shut down or leave your Mac until you have counted to a hundred, had a strong cup of your favourite beverage, and have worked out what to do next.

If you were just about to go out, for example, don’t rush at anything in a panic.

Although mis-updates used to be quite common in the past, they do still occur. Updating macOS is one of the most complex things that happens to your Mac, even when it’s ‘just’ a Security Update. The first and most important action is not to rush at trying to fix it, or give up in disgust and start reverting to the last version you were running. Instead of getting the latest, fixed and sweet-running version, Software Update dumps its ghost on you, and macOS is staggering along looking like it’s half dead. It happens: just when you think it’s safe to update macOS (even just a Security Update), it turns round and bites you on the bum.
