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Hardware faults are thankfully relatively rare, but if you can’t find the cause of a problem elsewhere, use the built-in Apple Diagnostics. First shut the Mac down (don’t just put it to sleep) and disconnect everything except power, keyboard, mouse, display, and internet. Then turn your Mac back on and immediately hold the D key until you’re asked to choose a language. Apple Diagnostics then takes a couple of minutes to do its work, and lets you know the verdict. If it looks like you will need professional help to resolve the issue, see “Professional repair options” further on.