To enter recovery mode, press and hold the power button on an M1 Mac that is shut down, wait until the display shows Loading Startup Options, then release it. Recovery mode is used to check the startup disk, reinstall macOS, restore from a backup, or change security settings. Once you know what the issue is, you’re free to restart or shut down your Mac. Clicking Get started launches Safari and displays a screen of Apple Diagnostics reference codes that pinpoint the hardware issue. It displays any issues found and diagnostic codes for those issues. If you’re at home and just want to check your hardware, click Run offline.Īfter a short diagnostic check lasting about a minute, a screen appears. When you’re on the phone with an Apple support person or at an Apple Store, they’ll have you click I agree in order to share information with the support personnel. (Sorry about the images, but normal screenshots are impossible in startup modes)Īpple uses this diagnostic tool to determine if anything is wrong with the hardware in your Mac. In addition, there are links for Run offline and I agree.
#Mac diagnostic boot disk serial#
At this point, a screen titled “Run Diagnostics” appears (see image below), displaying a barcode with your Mac serial number, a Restart button, and a Shutdown button. Press and hold Command ( ⌘ ) – D until the Mac restarts and the Diagnostics Loader menu appears in the menu bar.Ī list of languages appears – highlight the language you need, then click the blue OK button. There are also icons for the internal and external drives. When the Startup Options screen fully loads, you’ll see a “gear” icon with the label Options beneath it. Keep holding the power button until the display shows Loading Startup Options. Shut down your Mac, then press the power button to start it up again. Is that shiny new M1 Mac acting flaky? To check the hardware to see if you’re having any issues, diagnostics mode is very useful.
#Mac diagnostic boot disk how to#
In this post I’ll list those modes for the M1 Macs, what they’re used for, and how to access them. Safe Mode is just one of many Mac startup modes. Recently, Dennis Sellers published a great article on How to Start Your M1 Mac in Safe Mode.
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