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Am I supposed to press the D key before or after I enter my password once turning it on?
MacBook, macOS 10.15
You must shut down and press D immediately after pressing power button to start up again. Keep it pressed until diagnostics menu appears
You must shut down and press D immediately after pressing power button to start up again. Keep it pressed until diagnostics menu appears
Having said that my 2012 MBP on Catalina goes into Internet Recovery using that method so expect differences if your MacBook is an older one.
Diagnostic test
