Once the test is over, we will be given information about the error detected as well as the reference codes that we must write down in order to let Apple’s customer service know.When selecting the language, we will see a bar on a gray background that will indicate the progress of the diagnostics.We must keep it pressed until a screen to select the language appears. Once it has completely shut down, we can turn it on again and immediately afterwards we will keep pressing the D key on the keyboard.As this test is going to perform a ‘rough’ test, we must look for a rigid surface that allows good ventilation of the equipment. Disconnect all external devices that are connected to the Mac except the power connection, the keyboard, the screen or the Ethernet connection.
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