Click the Startup Disk icon in System Preferences, or choose View > Startup Disk. From the Apple menu choose System Preferences. You can change the startup disk your Mac automatically uses from System Preferences. Set the default startup disk.Whatever your needs, you can boot your Mac in a variety of modes to complete a task before startup all you need to do is press some keys down and wait for the chime (unless you have a newer MacBook Pro, sorry).Block the ability to start up in Target Disk mode (using the T key). Sometimes you need to boot in Recovery Mode to reinstall an OS or recover your hard drive via the internet. Sometimes your Mac isn't running correctly, so you need to reset the NVRAM and PRAM. The next time you start up or restart.
Command For Disk Utility At Startup Software From LoadingHere's what it does according to Apple: Start up from Apple Hardware Test or Apple DiagnosticsSafe mode is a way of starting up your Mac that makes sure it performs certain checks and prevents specific software from loading or opening automatically. Fsck is a command-line based tool which can help you verify and repair a disk.Here are all the keyboard shortcuts you can use when starting up your Mac! The next time you start up or restart your computer, your Mac starts up using the operating system on the selected volume.If you cannot start up your Mac Safe Mode or use Disk Utility while started up from a disc, you will need to use fsck. Select your startup disk from the list of available volumes. Click the Startup Disk icon in System Preferences, or choose View > Startup Disk.Startup Manager: option (alt)The Startup Manager lets you choose a different startup disk during boot. Release the shift key when you see the login window.You can leave safe mode by restarting your Mac without pressing any keys during startup. Start or restart your Mac and immediately press and hold shift on your keyboard. Deletes font caches, kernel cache, and other system cache files Prevents Startup Items and Login items from opening automatically Click the arrow or press return on your keyboard.Start up from Apple Hardware Test or Apple Diagnostics: DIf there are issues with your Mac that you think may be related to the hardware, you can run the Apple Hardware Test. Release the option key when you see the Startup Manager window. Start or restart your Mac and immediately press and hold the option key on your keyboard. Redream emulator mac versionSelect Apple Hardware Test or Apple Diagnostics.You can also hold option-D to start up from either utility over the internet. 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 Release the N key when you see the choices appear.Reset the NVRAM and PRAM: option-command-P-RSometimes specific processes on your Mac just don't work. Start or restart your Mac and immediately press and hold the N key on your keyboard. How to start up from a NetBoot server Your Mac must have capable firmware to boot from a system. ![]() 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. Boot in Recovery Mode: command-RSometimes, as a last-ditch effort, you need to boot in Recovery Mode, and either repair a disk or (NOOOOO!) reinstall macOS. If you have a Mac that plays a startup chime, you can release the keys after you heard it a second time.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. Release the keys after about 20 seconds. 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. Release the keys when you see white text on the screen.Target disk files allow you to share files between two Macs that are connected via FireWire, Thunderbolt 2, USB-C, or Thunderbolt 3. Start or restart your Mac and immediately press and hold command-S on your keyboard. How to boot up in the single-user mode You'll want to be an advanced user if you're considering this move. Release the keys when you see the Apple logo or a spinning globe.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 white text on the screen.Eject removable media on startup: ⏏, F12, mouse button, or trackpad buttonIf 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. Start or restart your Mac and immediately press and hold Command-V on your keyboard. How to start-up in the verbose mode Start up in verbose mode: command-VVerbose 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.After your Mac starts in target disk mode, you'll see it as a desktop icon on the other Mac. ![]() Press the power button to turn your MacBook on.Got any questions or other startup keyboard shortcuts to add? Sound off in the comments below!Updated June 2020 These are still all the keyboard shortcuts to use when starting up your Mac. Hold the three keys and the power button for 10 seconds. 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.
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