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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