Start up from macOS Recovery

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

Does the Mac OS X block you from using rm in those directories to delete a user or delete all the users and do you need to use sudo and put in an administrator password or does it let you without any passwords? For example if you typed in the following line into terminal would it just completely wipe everything? Cd /Users; echo rm -rf. RT Systems is proud to announce release of these programmers for the Mac operating system. These programmers will continue to be maintained for Windows and Mac. As each programmer is unique, the conversion to the Mac version is done one at a time. Click on any of those in the list for more details or to purchase that Programmer. This video will walk you through how to install R, XQuartz, and R Commander on a Mac. Restart your Mac from the Start menu in Windows. Press and hold the Option (or Alt) ⌥ key as your Mac begins to restart. Select your Mac startup volume (Macintosh HD) in the Startup Manager window, then press Return or click the up arrow: How to start up in Windows from macOS.

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

Rmtyronerf Mac OS

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.

How to start up in macOS from Windows

  1. From the notification area on the right side of the Windows taskbar, click to show hidden icons.
  2. Click the Boot Camp icon .
  3. From the menu shown, choose Restart in macOS.
    If you haven't installed the latest Boot Camp updates, you might get the message ”Could not locate the OS X boot volume.'

Or use Startup Manager as your Mac starts up:

  1. Restart your Mac from the Start menu in Windows.
  2. Press and hold the Option (or Alt) ⌥ key as your Mac begins to restart.
  3. Select your Mac startup volume (Macintosh HD) in the Startup Manager window, then press Return or click the up arrow:

How to start up in Windows from macOS

Rmtyronerf Mac Os Catalina

  • Use Startup Manager to choose your Windows (Boot Camp) volume during startup.
  • Or select your Boot Camp volume in Startup Disk preferences, then restart.

Mac Os Mojave

Learn more

  • If you're having difficulty using VoiceOver or another screen reader to complete these steps, please contact Apple Support.
  • Learn how to install Windows 10 on your Mac.