When you're done, you can choose Restart or Shut Down from the Apple menu. Then follow the onscreen service and support instructions.
Click ”Agree to send” to send your serial number and reference codes to Apple. If you choose to get more information, your Mac starts up from macOS Recovery and displays a web page asking you to choose your country or region.
To shut down, click Shut Down or press S.To restart your Mac, click Restart or press R.For more information, including details about your service and support options, click ”Get started” or press Command-G.To repeat the test, click ”Run the test again” or press Command (⌘)-R.Note the reference codes before continuing. If any issues are found, Apple Diagnostics suggests solutions and provides reference codes. Checking your Mac takes 2 or 3 minutes.
When Apple Diagnostics knows your language, it displays a progress bar indicating that it's checking your Mac: Keep holding until you see a screen asking you to choose your language.