Step 1: Prepare Your Mac
Shut down your Mac.
Disconnect all external devices
Step 2: Start Apple Diagnostics
Press and hold the power button on your Mac.
As you continue to hold the power button or touch ID, your Mac turns on and loads startup options. When you see Options, release the power button.
On Apple Silicon chips:
Press and hold Command (⌘)-D on your keyboard.
Follow the on-screen instructions and run Apple Diagnostics
You may be asked to choose a language and make sure that you have an active network connection. You can use the Wi-Fi Menu in the upper-right corner of your screen to choose a Wi-Fi network.
When testing is complete, Apple Diagnostics shows the results, including one or more reference codes
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