When you see the startup options window, release the power button.When turning on your Mac, press and hold the power button.When it’s finished, it will report what it has found and give you options for what to do next.Apple Diagnostics will now check your Mac for problems.Keep holding it until you see a window on the screen asking you to choose a language. Turn on your Mac and then press and hold the D key.Disconnect all external devices except the mouse, keyboard, display, power cable, and Ethernet cable if you use one.When you’ve ruled out all possible software errors and come to the conclusion that you have a hardware fault, Apple Diagnostics can help determine which piece of hardware is causing the problem. Press the Shift key and click Continue in Safe Mode.Press and hold the power button until the startup options window shows up.Shut down your Mac and wait 10 seconds.
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