How to Run Apple Diagnostics? Check MacBook Health [Use Hardware Test]

Troubleshoot Mac Hardware Issues with Apple Diagnostics

Is your Mac experiencing recurring hardware problems? Apple Diagnostics, a built-in utility available since 2013 (or its predecessor, Apple Hardware Test for older Macs), can help identify the source. This guide explains how to run Apple Diagnostics, interpret results, and resolve common issues.

Understanding Apple Diagnostics

Apple Diagnostics detects various hardware malfunctions, including power supply problems, battery issues, graphics card failures, logic board or CPU problems, and USB/Bluetooth connectivity issues. It's a free tool that can help diagnose slow performance, excessive fan noise, overheating, and more.

Preparing for the Diagnostic Test

Before running the test:

• Internet Connection: An internet connection is recommended to access support resources and potentially upload results to Apple.
• External Devices: Disconnect external hard drives, iPhones, iPads, etc. Keep your mouse, keyboard, and display connected.
• Power Adapter: For laptops, use the power adapter (AC power) to prevent battery drain and unexpected shutdowns.

Running Apple Diagnostics

The process varies depending on your Mac's chip:

M1, M2, or M3 Macs:

1. Hold down the power button until the startup options appear.
2. Press and hold Command D.
3. Wait for the diagnostic test to complete.
4. Shut down and restart your Mac normally.

Intel Macs:

1. Turn on your Mac and immediately press and hold the 'D' key.
2. Wait for the loading bar to appear, then complete the test. Shut down and restart normally.

Older Macs (Apple Hardware Test):

1. Shut down your Mac.
2. Turn on your Mac and hold down the 'D' key.
3. Select your language using the arrow keys and Enter key.
4. Run the test (select "Perform extended testing" for a more thorough check).
5. Note any error codes.

Interpreting Error Codes

Both Apple Diagnostics and Apple Hardware Test use similar error codes:

Error Code	Description
ADP000	No issues found
CNW001 - CNW006	Wi-Fi hardware problems
CNW007- CNW008	No Wi-Fi networks detected
NDC001 - NDC006	Camera issues
NDD001	USB hardware issues
... (Remaining codes from the table in the original text) ...	...

Troubleshooting Startup Issues

A firmware password can prevent Apple Diagnostics from starting. To disable it:

1. Boot into Recovery Mode (Command R).
2. Enter your firmware password.
3. Open Firmware Password Utility/Startup Security Utility.
4. Turn off the firmware password.
5. Restart your Mac.

Resolving Apple Diagnostics Errors

Resetting the NVRAM/PRAM or SMC often resolves errors.

Resetting NVRAM/PRAM:

• M1, M2, or M3 Macs: Simply shut down and restart.
• Intel Macs: Restart and hold Option Command P R during startup (until you hear the startup sound twice).

Resetting SMC:

The process depends on your Mac's chip (Intel, T2, or M1-M3). Refer to the original text for detailed instructions based on your Mac's type and battery configuration.

Advanced Troubleshooting

If Apple Diagnostics reports no issues but problems persist, consider using additional diagnostic tools. Even if errors are found, automated repair tools can assist in the resolution process.

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