You can turn it on again after using Apple Diagnostics. If you’re using a firmware password, turn it off.If holding down the D key at startup doesn’t start Apple Diagnostics: ![]() Note that occasionally a reference code is not listed on Apple’s support website or the suggested fix for a particular problem is to simply “Contact Apple.” Either way, you’ll know if your system is more or less OK or if it needs service by the time this test completes. Have you found issues with reference codes? Those can be looked up here. Testing will take 2 or 3 minutes and will present you with a “No issues found” message or a list of issues and reference codes. Once a language is selected, Apple Diagnostics will get to work. Of course, it will skip this step if an ethernet cable is connected. It’s possible that you will first get asked to join a Wi-Fi network if the diagnostic image can’t be pulled from the machine itself, but it should join known networks automatically. With the arrow keys on your keyboard, navigate to the language you want and hit the return key. Keep holding the key until you get the option to select a language. To launch Apple Diagnostics, begin with your Mac turned off, and simply start up your Mac and hold down the D key right after pressing the power button. This is available for any Mac from June 2013 and newer. Let’s begin the health checkup with a hardware diagnostic test. When dealing with hardware woes, it can be a daunting task to determine which hardware component is failing. Dozens of sensors and components that get really hot, moving parts (not so much on newer Macs), and so much more-things the macOS does not tell you about or let you control, and all of it makes up the “It just works” experience. There is so much going on inside your Mac.
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