![]() ![]() You can also check any reference codes you noted down against Apple's official code table for more information. If you click Get Started for more information about an issue that Apple Diagnostics has identified, your Mac will boot into macOS Recovery Mode and display a web page asking you to choose your country or region.Ĭlick Agree to send to send your serial number and reference codes to Apple, and follow the onscreen service and support instructions. Otherwise you can click Restart or Shut Down to exit diagnostics. For more information about an issue, click Get Started. To repeat the test, click Run test again.Note any issue reference codes before continuing. Once the scan is complete, a list of any potential hardware issues will appear on the screen or a "No issues found" message will be displayed.On newer Macs this usually takes at least a couple of minutes, but AHT can take a lot longer, especially if you chose extended testing. Wait for the progress bar to fill while a scan of your Mac's hardware is performed.On post-2013 Macs, simply select the Test option. If you have an earlier Mac, the equivalent is called an Apple Hardware Test (AHT), but the basic principles are the same. Select this option if desired and click the Test button. Apple Diagnostics is built into every Mac released since June 2013. If your Mac is a pre-2013 model, you'll be given the option to "Perform extended testing," which essentially checks every block of your Mac's memory.Join a local Wi-Fi network if prompted.Release the D key when the prompt appears on the screen asking you to choose your language using the arrow keys.(To start Apple Diagnostics over the internet, hold down Option-D.) ![]() Press the power button on your Mac and then immediately press and hold down the D key on the keyboard.Next, shut down your Mac, disconnect all external devices except keyboard, mouse, display, and any Ethernet connection, and then follow the steps below. To start using Apple Diagnostics or AHT, first turn off any firmware password if you're using one. The Mac Mini labeled 4 is suggested to provide local copies of boot-up and recovery tools to avoid large, repetitive downloads. However, if you've troubleshooted software and the problem persists, it's time to consider whether it's your Mac's hardware that's at fault.ĭisk Utility is the first program you should fire up if you suspect disk errors or permission issues, but if that fails to identify the problem or you can't even get your Mac to boot up into the operating system, you can try using Apple's integrated Mac diagnostics tool.Īpple Diagnostics is built into every Mac released since June 2013. A diagram from the Apple Services Toolkit 2 manual, showing the need for a technician’s computer (3) to have an active Global Services Exchange connection (2) to run diagnostics on the device being repaired (1). The best way to prevent problems from cropping up is to make sure you are using the latest versions of Apple's programs and third-party applications. Mac benchmark apps can also help you gauge your Mac's overall performance.Mac issues can occur for a variety of reasons, but in general most errors can be traced back to unstable software. While these codes only provide a limited amount of information, it might be enough to point you in the right direction. Apple may provide or recommend responses as a possible solution based on the information provided every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the. Running Apple Diagnostics can be a great way to. VFF001: Possible problem with audio hardware. This site contains user submitted content, comments and opinions and is for informational purposes only. Nick deCourville 2 minute read Dec 22nd, 2022 3:16 PM EST How-To This guide will show you how to use Apple Diagnostics to test your Mac.PPM001-015: Possible problem with computer memory. With the Carly app and scanner you can carry out diagnostics on your car, uncover odometer fraud or code your vehicle. Sad Mac ( middle ) appears when an older iPod flunks its internal hard drive diagnostics.PFR001: Possible problems with firmware.NNN001: No serial number detected are you running a Hackintosh?.NDD001: Possible problems with USB hardware make sure all USB devices are disconnected.ADP001: Good news! This means no errors were detected.You can cross-reference them using the Apple Support reference codes list. If you're using Apple Diagnostics, you'll have a greater array of codes at your disposal. I tested an old MacBook Air that has no battery in it, and the AHT report and reference code matched up. ![]() Apple Hardware Test should provide some fairly easy-to-understand diagnoses, including reference codes.
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