Option-Command (⌘)-P-R Reset NVRAM (or PRAM). macOS Recovery installs different versions of macOS, depending on the key combination you use while starting up. Option-Command-R to start up from macOS Recovery over the Internet. IMac Pro doesn't support this startup key.Ĭommand-R Start up from the built-in macOS Recovery system. To use the default boot image on the NetBoot server, hold down Option-N instead. N Start up from a compatible NetBoot server, if available. Or use Option-D to start up from this utility over the Internet.

If your Mac is using a firmware password, you're asked to enter the password first.ĭ Start up from the built-in Apple Hardware Test or Apple Diagnostics utility, depending on your Mac model. 11.Option (⌥) Start up to Startup Manager, which allows you to choose other startup disks, if available. This mode is good for when you need to troubleshoot a startup issue, or modify a file or application that is preventing proper startup. This is a terminal interface that allows you to login and interact with your computer via text input only. Holding down Command + S during startup will boot your Mac into Single User Mode. Verbose mode exits automatically when the computer's startup process progresses sufficiently and the blue screen appears. It will contain information important to startup, allowing you to diagnose startup problems by seeing any errors that may be occurring during startup. Using this key combination will cause your Mac to become very verbose on startup and will show a terminal-like interface while booting. Press Command + V During StartupĬommand + V boots your Mac into what is called Verbose Mode. Check out this article for more information about booting into Safe Mode. If you are having OS X boot problems, always try this first to check and see if you have a rogue piece of software preventing your Mac from booting properly. This Safe Mode feature is a great way to troubleshoot OS X applications and extensions that aren’t working properly. It will disable all non system fonts, all startup items, and login items. Start up your machine while holding down the Shift key to have OS X only load required kernel extensions and login items. OS X includes a boot option called Safe Mode. Follow our guide on Target Disk Mode for more information on how it works.

Sometimes it’s best to just retrieve those files and start fresh with a clean copy of OS X. Target Disk Mode is a great way to retrieve your files from your Mac if your machine refuses to boot properly.

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