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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.

Mac Hard Drive Diagnostic

If your Mac was introduced before June 2013, it uses Apple Hardware Test instead.

On your Mac, choose Apple menu Restart, then press and hold the D key while your Mac restarts. When the Apple Hardware Test chooser screen appears, select the language you want to use, then press the Return key or click the right arrow button. If you don’t see the chooser screen, Apple Hardware Test may not be available on your Mac.
This drive also perhaps the most interesting drive on test here. You can use the WD My Passport Wireless Pro like a standard wired hard drive, but it also has integrated Wi-Fi and a 10-hour.
Flash drives (like thumb drives) are external hardware devices that you can add to your Mac for additional storage room or as secure places to back up your data. Here, you see one internal hard drive (the 1TB SATA entry, which is selected) and one USB external hard drive (the Toshiba entry).

How to use Apple Diagnostics

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.

Hard Drive Test For Mac