Eject (⏏) or F12 or mouse button or trackpad button: Eject removable media, such as an optical disc. Disabled in macOS Mojave or later, or when using a firmware password. Command-S: Start up in single-user mode. To use the default boot image on the server, hold down Option-N instead. N: Start up from a NetBoot server, if your Mac supports network startup volumes. Or use Option-Dto start up to this utility over the Internet. D: Start up to the Apple Diagnostics 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 NVRAM or PRAM. If your Mac is using a firmware password, you're prompted to enter the password. 
Option (⌥) or Alt: Start up to Startup Manager, which allows you to choose other available startup disks or volumes. macOS Recovery installs different versions of macOS, depending on the key combination you use while starting up. Or use Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the Internet. Command (⌘)-R: Start up from the built-in macOS Recovery system. Keep holding until the described behavior occurs. 
Press and hold the power button until you see the startup options screen. You should now see the macOS Utilities window. Type in your admin name and password when prompted. Release Command-R when you see the Apple logo or another image. To use any of these key combinations, press and hold the keys immediately after pressing the power button to turn on your Mac, or after your Mac begins to restart. Press and hold Command-R, then press the power button.
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