How To Run Diagnostics on Mac [2020]

step-by-step-guide-to-run-diagnostics-on-macIf any of your Mac devices is causing some hardware issue you might want to run diagnostics. It will help you determine which of the hardware component is causing the issue in your device. This guide shows how to run diagnostics on Mac devices which released after mid-2013. If you have a device which was released before that you can read this guide.

Steps to Run Diagnostics on Mac

Before you run diagnostics on your device, make sure your device is turned off and no external devices are attached. You can run diagnostics on your mac while the keyboard and mouse are connected with computer. Now, follow the below steps to initiate diagnostics;

  • As soon as your turn on Mac, press and hold the ‘D‘ key button on the keyboard.
  • Hold the key until you see ‘Choose the Language’ window.
  • Choose the language from the list to initiate diagnostics.
  • Diagnostics process will take a few minutes.

After 2-5 minutes, diagnostics will come up with solutions if any hardware problem were found during the test. Diagnostics only run the test for internal hardware component and will not check the external hardware components of the device. If diagnostics successfully finds the issue it will give you a reference code. Note down this reference code and check it here in what this Reference Coed Means.

After the test, you might want to restart or turn off your Mac or run the test again. Here, you can do it through the power button or through the command keys.

  • Click on ‘Run the Test Again‘, to initiate the test again
  • To get more information about the issue click on ‘get started‘ or press ‘G‘.
  • Press ‘R‘ key, to restart your Mac.
  • To shut down press ‘S‘ key.


Once, you the diagnostics have found the component/issue causing problem and provide you the reference code. Now you can visit Apple care to resolve the issue or can repair/replace the component yourself.


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