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Using Apple Diagnostics
Posted by UCS IT Support 4 on 07 April 2016 04:42 PM

 

Using Apple Diagnostics

To start Apple Diagnostics:

  1. Turn off your computer if it is on by choosing Shut Down from the Apple () menu.
  2. Press the power button to turn on your computer.
  3. Immediately press and hold the D key until Apple Diagnostics begins.
  4. If you previously selected a language for the computer, a "Checking your Mac" screen will appear in that language.

    If you have not selected a language for the computer, a language selection menu will appear. Select a language and then press the Return or Enter key. Apple Diagnostics will begin. ​  

  5. The basic Apple Diagnostics test takes approximately 2-3 minutes to complete. As the diagnostic runs, a progress bar indicates the time remaining in the test.



    • If no issues are found: A "No issues found" message appears.
    • If issues are found: Apple Diagnostics finishes and displays a brief description of any issues it finds along with one or more reference codes and additional instructions. Be sure to make a note of these reference codes before continuing.

  6. To exit Apple Diagnostics, click Restart or Shut Down at the bottom of the screen.

 

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