Put a Mac into Diagnostics Mode

  1. If you're using a wired Ethernet connection to connect the Mac you're testing to the internet, connect the Ethernet cable to the Mac before turning on the computer. If you're using Wi-Fi, you will connect later in step 5 after the computer starts into diagnostics mode.

  2. Press and hold the power button on the Mac to be tested to turn on the computer. On laptop computers that have Touch ID, press and hold the Touch ID button.

  3. As you continue to hold the power or Touch ID button, the Mac will turn on and load startup options. When you see Loading startup options..., release the power or Touch ID button.

  4. When the startup options screen appears, press and hold Command (⌘)-D on the Mac's keyboard to enter diagnostics mode.

  5. When the message Diagnostics & Repair appears, the Mac is in diagnostics mode. Click Continue, select a Wi-Fi network, and agree to terms and conditions.

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