Chapter 22
Troubleshooting macOS
IN THIS CHAPTER
Knowing what to do when your Mac won’t boot
Dealing with prohibitory signs and messages
Recovering from start-up crashes
Using the Optimize Storage feature
Macs have a great reputation for running well and just keeping on running well — and I hope that your Mac does just that. But even the best hardware and software can run into difficulties sometimes, so you should be prepared to troubleshoot your Mac and its operating system at some point.
When things go wrong with your Mac, turn to the advice in this chapter. It contains tried-and-tested tips and tricks that can help you resolve many common Mac issues without a trip to the repair shop — as long as your Mac’s hardware isn’t dead. If it is dead, turn to the Apple Store or the repair shop rather than this chapter.
Before we start, you need to be clear on two key terms. First, this chapter uses the term hard disk generically to refer to both hard disks (mechanical disks with spinning platters) and solid-state drives, or SSDs (electronic drives with no moving parts). Second, booting ...
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