Start up from the built-in macOS Recovery system. ![]() Computers that have the Apple T2 chip don't support this startup key. To use the default boot image on the NetBoot server, hold down Option-N instead. Start up from a compatible NetBoot server, if available. Or use Option-D to start up from this utility over the Internet. Start up from the built-in Apple Hardware Test or Apple Diagnostics utility, depending on your Mac model. Start up to Startup Manager, which allows you to choose other startup disks, if available. If your Mac is using a firmware password, you're asked to enter the password first. If your Mac is using a firmware password, all of these key combinations are disabled, except as noted below. Keep holding until the described behavior occurs. To use any of these key combinations, press and hold the keys immediately after pressing the power button to turn on your Mac, or immediately after your Mac begins to restart. Learn about the Mac features and tools that you can access by holding down one or more keys during startup.
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