![]() 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.The object of these key combinations is to perform different functions, many of which are useful in the maintenance of Macs. ![]() Startup key combinations are invoked immediately following the startup chime, and before the grey Apple logo appears in the middle of the screen, when you power-on your Mac. ![]() Pressing the C key immediately after the startup chime will enable the. Startup key combinations are so important, and if you are unfamiliar with them, you’ll want to bookmark this page as a good reference post. Every Mac technician knows them and uses them on a daily basis. ![]()
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