Hold the three keys and the power button for 10 seconds.
#Mac restart hold d diagnostics mac
Start or restart your Mac and immediately press and hold shift-control-option on the left side of your keyboard and then press and hold the power button at the same time.Note: If the battery in your MacBook is removable (older MacBooks), then just take it out, press the power button for 5 seconds, and put the battery back in and turn it on again. There are many things you should try before resetting the SMC (opens in new tab), but if you're at the end of your rope, then reset it. The SMC (system management controller) is a system that controls the hardware in your MacBook, including components like cooling fan speeds, power, display management, port illumination, and more. Reset the SMC in MacBooks: shift-control-option Release when your removable media is ejected.Start or restart your Mac and immediately press and hold the eject button (⏏), F12, your mouse button, or your trackpad button.If you don't want an external hard drive to mount on startup or you simply want your CD or flash drive out as quickly as possible when you turn on your Mac, you can eject it right on startup. Release the keys when you see the white text on the screen.Įject removable media on startup: ⏏, F12, mouse button, or trackpad button.Start or restart your Mac and immediately press and hold Command-V on your keyboard.Verbose mode is another startup mode for advanced users, which allows you to enter UNIX commands to try and isolate startup-related issues. You can treat it just like an external hard drive and drag it to the trash when you want to "eject" it. Start or restart your Mac and immediately press and hold T on your keyboard.Īfter your Mac starts in target disk mode, you'll see it as a desktop icon on the other Mac.One Mac shows up as an external disk on the other Mac, so you can browse and copy files over like you would from a hard drive. Target disk files allow you to share files between two Macs that are connected via FireWire, Thunderbolt 2, USB-C, or Thunderbolt 3. Release the keys when you see white text on the screen.Start or restart your Mac and immediately press and hold command-S on your keyboard.You'll want to be an advanced user if you're considering this move. If you're comfortable with UNIX, sometimes you may want to boot your Mac in single-user mode, which lets you try and isolate startup-related issues. Release the keys when you see the Apple logo or a spinning globe.Startup or restart your Mac and immediately press and hold command-R on your keyboard.
#Mac restart hold d diagnostics how to
If any of that is the case, then here's what to do: How to boot up your Mac in Recovery Mode You may also need to restore from a Time Machine backup. Sometimes, as a last-ditch effort, you need to boot in Recovery Mode, and either repair a disk or (NOOOOO!) reinstall macOS. You may have to go back into System Preferences and adjust settings like volume and display resolution to your liking since they get reset when you reset the NVRAM. If you have a Mac that plays a startup chime, you can release the keys after you heard it a second time. Release the keys after about 20 seconds.
Start up from a NetBoot server: Nīooting from a NetBoot server allows you to boot from a network, rather than a local hard disk or optical disk drive. You can also hold option-D to start up from either utility over the internet. Select Apple Hardware Test or Apple Diagnostics.Release the D key when you see the choices appear.Start or restart your Mac and immediately press and hold the D key on your keyboard.How to start up from the Apple Hardware Test or Apple Diagnostics You can run Apple Diagnostics once you think you've isolated the issue to a possible hardware issue. If there are issues with your Mac that you think may be related to the hardware, you can run the Apple Hardware Test. Start up from Apple Hardware Test or Apple Diagnostics: D Click the arrow or press return on your keyboard.Release the option key when you see the Startup Manager window.
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