After isolating an issue on your Mac to a possible hardware issue, you can use Apple Diagnostics to help determine which hardware component might be causing the issue. Apple Diagnostics also suggests solutions and helps you contact Apple Support for assistance.
During this time, the Apple Hardware Test is being downloaded to your Mac. Once the download is complete, you will see the option to select a language. Use the mouse cursor or the Up/Down arrow keys to highlight a language to use, and then click the button in the bottom right-hand corner (the one with the right-facing arrow). Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Ashford Hospitality Trust Inc (AHT): Free Stock Analysis Report To read this article on Zacks.com click here.
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Apple Diagnostics and Apple Hardware Test are tools for diagnosing problems with your computer's internal hardware, such as the logic board, memory, and wire. Mac models introduced before June 2013 don’t of course run Diagnostics as such, but an older version named Apple Hardware Test, or AHT, and it’s those which are most prone to being unable to run locally, because of the way in which AHT is installed.
If your Mac was introduced before June 2013, it uses Apple Hardware Test instead.
How to use Apple Diagnostics
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- Disconnect all external devices except keyboard, mouse, display, Ethernet connection (if applicable), and connection to AC power.
- Make sure that your Mac is on a hard, flat, stable surface with good ventilation.
- Shut down your Mac.
- Turn on your Mac, then immediately press and hold the D key on your keyboard. Keep holding until you see a screen asking you to choose your language. When Apple Diagnostics knows your language, it displays a progress bar indicating that it's checking your Mac:
- Checking your Mac takes 2 or 3 minutes. If any issues are found, Apple Diagnostics suggests solutions and provides reference codes. Note the reference codes before continuing.
- Choose from these options:
- To repeat the test, click ”Run the test again” or press Command (⌘)-R.
- For more information, including details about your service and support options, click ”Get started” or press Command-G.
- To restart your Mac, click Restart or press R.
- To shut down, click Shut Down or press S.
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. Click ”Agree to send” to send your serial number and reference codes to Apple. Then follow the onscreen service and support instructions. When you're done, you can choose Restart or Shut Down from the Apple menu.
This step requires an Internet connection. If you're not connected to the Internet, you'll see a page describing how to get connected.
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If holding down the D key at startup doesn't start Apple Diagnostics:
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- If you're using a firmware password, turn it off. You can turn it on again after using Apple Diagnostics.
- Hold down Option-D at startup to attempt to start Apple Diagnostics over the Internet.