T: Start up in target disk mode.В Disabled when using a firmware password.Disabled inВ macOS Mojave or later, orВ when using a firmware password. Command-S:В Start up inВ single-user mode.To use the default boot image on the server, press and hold Option-N instead.В Disabled when using a firmware password. N: Start up from a NetBoot server, if your Mac supports network startup volumes.Or use Option-D to start up to this utility over the internet.В Disabled when using a firmware password. D:В Start up to the Apple DiagnosticsВ utility.If your Mac is using a firmware password, it ignores this key combination or starts up from macOS Recovery. Option-Command-P-R: Reset NVRAMВ or PRAM.If your Mac is using a firmware password, you're prompted to enter the password. Option (вЊҐ) or Alt:В Start up to Startup Manager, which allows you to choose other available startup disks or volumes.macOS Recovery installs different versions of macOS,В depending on the key combination you use.В If your Mac is using a firmware password, you're prompted to enter the password. Or use Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the internet. Command (вЊ)-R:В Start up from the built-in macOS RecoveryВ system.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 toВ turn on your Mac, or after your Mac begins to restart.

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