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Start up from macOS Recovery

Mac OS X & macOS names As you can see from the list above, with the exception of the first OS X beta, all versions of the Mac operating system from 2001 to 2012 were all named after big cats, from. OS X 10.10 Yosemite; OS X 10.9 Mavericks; OS X 10.8 Mountain Lion (TLS/SSL/CA certificate embedding and certificate pinning not supported) OS X 10.7 Lion (TLS/SSL/CA certificate embedding and certificate pinning not supported) Only supported by SEB 1.5.2: Mac OS X 10.6 Snow Leopard. On your Mac, choose Apple menu System Preferences, then click Language & Region. Open Language & Region preferences for me. Do one of the following: Choose a language for an app: Click the Add button, choose an app and a language from the pop-up menus, then click Add. Change the language for an app in the list: Select the app, then choose a new language from the pop-up menu. About macOS Recovery. MacOS Recovery is the built-in recovery system of your Mac. On a Mac with Apple silicon, you can use macOS Recovery to repair your internal disk, reinstall macOS, restore your files from a Time Machine backup, set the security policy for different disks, transfer files between two Mac computers, start up in safe mode and more. Mac OS Asking for Keychain Password Repeatedly. Your keychain might log itself out without your.

Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:

Apple silicon

Turn on your Mac and continue to press and hold the power button until you see the startup options window. Click the gear icon labeled Options, then click Continue.

Intel processor

Make sure that your Mac has a connection to the internet. Then turn on your Mac and immediately press and hold Command (⌘)-R until you see an Apple logo or other image.

If you're asked to select a user you know the password for, select the user, click Next, then enter their administrator password.

Reinstall macOS

Select Reinstall macOS from the utilities window in macOS Recovery, then click Continue and follow the onscreen instructions.

Follow these guidelines during installation:

  • If the installer asks to unlock your disk, enter the password you use to log in to your Mac.
  • If the installer doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk first.
  • If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.
  • Allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.

After installation is complete, your Mac might restart to a setup assistant. If you're selling, trading in, or giving away your Mac, press Command-Q to quit the assistant without completing setup. Then click Shut Down. When the new owner starts up the Mac, they can use their own information to complete setup.

Other macOS installation options

When you install macOS from Recovery, you get the current version of the most recently installed macOS, with some exceptions:

  • On an Intel-based Mac: If you use Shift-Option-Command-R during startup, you're offered the macOS that came with your Mac, or the closest version still available. If you use Option-Command-R during startup, in most cases you're offered the latest macOS that is compatible with your Mac. Otherwise you're offered the macOS that came with your Mac, or the closest version still available.
  • If the Mac logic board was just replaced, you may be offered only the latest macOS that is compatible with your Mac. If you just erased your entire startup disk, you may be offered only the macOS that came with your Mac, or the closest version still available.

You can also use these methods to install macOS, if the macOS is compatible with your Mac:

  • Use the App Store to download and install the latest macOS.
  • Use the App Store or a web browser to download and install an earlier macOS.
  • Use a USB flash drive or other secondary volume to create a bootable installer.

Check Date & Time preferences

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  1. Choose Apple menu  > System Preferences, then click Date & Time.
  2. Click the lock in the corner of the window, then enter your administrator password to unlock the settings. (The settings are dimmed when locked.)
  3. In the Date & Time pane, make sure that ”Set date and time automatically” is selected and your Mac is connected to the internet. Your Mac can then get the current date and time from the network time server selected in the adjacent menu.

If you don't have an internet connection, or you want to set the date and time manually, deselect ”Set date and time automatically.” You can then click today’s date on the calendar, drag the clock’s hands to the correct time, or use the fields above the calendar and clock to enter the date and time. Then click Save.

Check Time Zone preferences

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  1. Choose Apple menu  > System Preferences, then click Date & Time.
  2. Click the lock in the corner of the window, then enter your administrator password to unlock the settings. (The settings are dimmed when locked.)
  3. In the Time Zone pane, make sure that ”Set time zone automatically using current location” is selected and your Mac is connected to the internet.

If you don't have an internet connection or you want to set the time zone manually, deselect ”Set time zone automatically using current location.” Then click the map to choose a time zone.

If your Mac says that it's unable to determine your current location:

  1. Choose Apple menu  > System Preferences, then click Security & Privacy.
  2. From the Privacy pane, select ”Enable Location Services.”
  3. Scroll down to the bottom of the list of apps and services, then click the Details button next to System Services.
  4. Make sure that the checkbox for time zone is selected.

Check Language & Region preferences

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Choose Apple menu  > System Preferences, then click Language & Region.

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  • Make sure that the Region menu is set correctly for your region.
  • Use the ”Time format” checkbox to control whether your Mac displays time in the 24-hour format.

For advanced formatting options, click the Advanced button, then check the settings in the Dates pane and Times pane. These settings control how dates and times are displayed in the Finder and apps. If any settings have been changed, you can click the Restore Defaults button in each pane to use the default settings for your region. If the button is dimmed, your Mac is already using the default settings.