This guide shows you how to use Apple Diagnostics to test your Mac. Running Apple Diagnostics can be a great way to check if your device has a hardware problem. Completing this test will help you determine if a specific hardware component is causing the problem.
Running Apple Diagnostics can also be helpful, as the program will suggest solutions to your problem and also help users contact Apple Support if they need additional assistance.
Before starting, you need to perform a few steps.
What to do before running Apple Diagnostics
- Turn off your Mac. Go to the Apple menu and select Shut Down.
- When your device is turned off, disconnect all external devices except your keyboard, mouse, display, Ethernet connection (if you have one), and your connection to an AC power source.
- Make sure the device is on a flat, hard and stable surface and has adequate ventilation for your device.
From here, you need to determine if your machine has an Apple silicon or an Intel processor.
How to determine the processor of your device
- To determine this, go to the Apple menu and choose About This Mac.
- If you’re using Apple silicon, the About This Mac page will show an item called Chip, and the name of the chip will appear.
- If you have an Intel processor, About This Mac displays an item called Processor that displays the name of your Intel-based processor.
Once you have identified your processor, follow the appropriate steps.
How to start the Apple diagnostic test
To start Apple Diagnostics with Apple Silicon, follow these steps:
- Turn on your Mac and continue to hold down the power button while your Mac is on.
- Release the power button when you see the launch options window.
This includes a gear icon labeled Options.
- Press Command (⌘) and D on your keyboard.
To start Apple Diagnostics with an Intel processor, follow these steps:
- Turn on your Mac. While the Mac is on, press and hold the D key.
- Release the D key when you see a progress bar or when prompted to select a language.
- If you want to connect your Intel-based device to the Internet, press Option-D at startup.
Run the Apple Diagnostic Test
Required time: 30 minutes.
How to run an Apple diagnostic test
- During the test, Apple Diagnostics displays a progress bar while it tests your device.
- When the test is complete, Apple Diagnostics will show you the results.
You will be given a referral code. For a list of reference codes and what actions to take, you can find them on Apple’s official site here.
- If you want to run the test again, click Run Test or press Command-R.
- Click Restart or press R to restart your device.
- Click Shut Down or press S to reboot your device.
- Apple will also provide you with service or support options.
Make sure your device has an Internet connection and click Start or press Command-G. This will restart your Mac and take you to a web page with more information. You can then restart or turn off your device from the Apple menu.
Using Apple Diagnostics can be a great way to determine if there are any hardware issues with your device. If you think your device is having problems, be sure to run the Apple Diagnostics test to see what conditions your Mac might be experiencing.
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