How to use Apple Diagnostics to identify Mac hardware problems

Apple’s Macs are usually pretty reliable, but when they do go wrong the Apple Diagnostics tool should help you figure out if you have a software or a hardware problem, but you need to know a few things to understand what it says.

What is Apple Diagnostics?

Apple Diagnostics is designed to put your hardware through a variety of tests designed to detect power supply, battery, graphics, logic board, USB and a huge range of other potential problems. While this test doesn’t cover every eventuality, it’s very good at identifying the most frequent hardware problems you can get using a Mac. You access these tests using a keyboard shortcut when you startup your Mac. They are also available via the Internet.

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