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. Keep holding until the described behaviour occurs.

• Command (⌘)-R: Start up from the built-in macOS Recovery system. Or use Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the Internet. macOS Recovery installs different versions of macOS, depending on the key combination you use while starting up. 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. If your Mac is using a firmware password, you're prompted to enter the password.
  
• Option-Command-P-R:Reset NVRAM or PRAM. If your Mac is using a firmware password, it ignores this key combination or starts up from macOS Recovery.
• Shift (⇧): Start up in safe mode. Disabled when using a firmware password.
• D: Start up with the Apple Diagnostics utility. Or use Option-Dto start up this utility over the Internet. Disabled when using a firmware password.
• N: Start up from a NetBoot server, if your Mac supports network startup volumes. To use the default boot image on the server, hold down Option-N instead. Disabled when using a firmware password.
• Command-S: Start up in single-user mode. Disabled in macOS Mojave or later, or when using a firmware password.
• T: Start up in target disk mode. Disabled when using a firmware password.
• Command-V: Start up in verbose mode. Disabled when using a firmware password.
• Eject (⏏) or F12 or mouse button or trackpad button: Eject removable media, such as an optical disc. Disabled when using a firmware password.

If a key combination doesn't work

If a key combination doesn't work at startup, one of these solutions might help:

• Be sure to press and hold all keys in the combination together, not one at a time.
• Shut down your Mac. Then press the power button to turn on your Mac. Then press and hold the keys as your Mac starts up.
• Wait a few seconds before pressing the keys, to give your Mac more time to recognise the keyboard as it starts up. Some keyboards have a light that flashes briefly at startup, indicating that the keyboard is recognised and ready for use.
• If you're using a wireless keyboard, plug it into your Mac, if possible. Or use your built-in keyboard or a wired keyboard. If you're using a keyboard made for a PC, such as a keyboard with a Windows logo, try a keyboard made for Mac.
• If you're using Boot Camp to start up from Microsoft Windows, set Startup Disk preferences to start up from macOS instead. Then shut down or restart and try again.

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Remember that some key combinations are disabled when your Mac is using a firmware password.

• That key recovery then breaks all parts of your protocol that used that key. For example, if you implement a bad MAC algorithm, a break against that algorithm might not only break the authentication but also the confidentiality of your message. (20 bytes for PBKDF2-HMAC-SHA-1). I only violate the 'use a key for a single purpose' principle.
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• What is Keychain Access on Mac? Keychain Access is a macOS app that stores your passwords and account information and reduces the number of passwords you have to remember and manage. When you access a website, email account, network server, or other password-protected item, you may be given the option to remember or save the password.

Learn more

• Find out what to do if your Mac doesn't turn on.
• Find out about Mac keyboard shortcuts that you can use after your Mac has started up.

Keychain Access User Guide

Keychain Access is a macOS app that stores your passwords and account information and reduces the number of passwords you have to remember and manage.

When you access a website, email account, network server, or other password-protected item, you may be given the option to remember or save the password. If you choose to save the password, it’s saved in your keychain so you don’t have to remember or type your password every time.

Because Keychain Access securely stores and retrieves your user names, passwords, and other information, you can make individual passwords more complex and difficult to break. This can make your individual accounts more secure.

Important: To ensure that passwords and other data stored in your keychain are secure, make sure to set up a login password for your computer. See Change the login password.

You can store any type of sensitive information in Secure Notes.

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You can also use Keychain Access to manage certificates, which are issued by trusted organizations to validate websites, digital documents, and other web-based materials.

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Keychain Access works in collaboration with iCloud keychain, which lets you share keychains with your other devices. To create and manage your iCloud keychain, sign in to iCloud with your Apple ID. See the Apple Support article Set up iCloud Keychain.

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