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Shut down your Mac, then press the power button to start it up again. Keep holding the power button until the display shows Loading Startup Options. When the Startup Options screen fully loads, you’ll see a “gear” icon with the label Options beneath it. There are also icons for the internal and external drives. Press and hold Command ( ⌘ ) – D until the Mac restarts and the Diagnostics Loader menu appears in the menu bar.
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Is nochtans allemaal niet gebeurd.
Nee, ik denkt niet dat dit de uitleg is.
Blijft voorlopig een raadsel.