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I recently installed a full licensed windows 10 home edition through boot camp. I have a MacBook Pro 2105. I cannot get back to Mac OS X. I've tried multiple times restarting/powering off computer and pressing down the option key. It does give me the icon to click to switch to Mac but every time I click on it, it restarts and gives me a symbol with a circle and slash (indicating it can't/ won't perform the function). And the computer still windows mode. I've also tried the icon panel in the bottom right which I can open up the bootcamp control panel. It gives me a choice to restart in Mac or windows. I choose Mac and the same thing happens. When it restarts, I get that circle with a slash and I am still in windows. Help!! Thanks!!

MacBook Pro with Retina display, iOS 8.4.1

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Reinstall from macOS Recovery

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macOS Recovery makes it easy to reinstall the Mac operating system, even if you need to erase your startup disk first. All you need is a connection to the Internet. If a wireless network is available, you can choose it from the Wi-Fi menu , which is also available in macOS Recovery.

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Dec 26, 2017. Jul 31, 2020. Aug 29, 2015. Sep 05, 2020. Global Nav Open Menu Global Nav Close Menu; Apple; Shopping Bag +. Search Support.

1. Start up from macOS Recovery

To start up from macOS Recovery, turn on your Mac and immediately press and hold one of the following sets of keys on your keyboard. Release the keys when you see an Apple logo, spinning globe, or other startup screen.

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Command (⌘)-R

Reinstall the latest macOS that was installed on your Mac (recommended).

Option-⌘-R

Upgrade to the latest macOS that is compatible with your Mac.

Shift-Option-⌘-R

Reinstall the macOS that came with your Mac, or the closest version still available.

You might be prompted to enter a password, such as a firmware password or the password of a user who is an administrator of this Mac. Enter the requested password to continue.

Do you want the models with broken keyboard, or the one with the good keyboard?I sure hope Apple hurries to get the fix to the rest of the lineup. I couldn't recommend any other models to anyone at this point.Fortunately for me, Apple pushed me to a desktop setup again with all this baloney, so I don't know if I'll ever return to an Apple laptop. Which mac computer to buy.

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When you see the utilities window, you have started up from macOS Recovery.

2. Decide whether to erase (format) your disk

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You probably don't need to erase, unless you're selling, trading in, or giving away your Mac, or you have an issue that requires you to erase. If you need to erase before installing macOS, select Disk Utility from the Utilities window, then click Continue. Learn more about when and how to erase.

3. Install macOS

When you're ready to reinstall macOS, choose Reinstall macOS from the Utilities window. Then click Continue and follow the onscreen instructions. You will be asked to choose a disk on which to install.

  • 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 is for a different version of macOS than you expected, learn about macOS Recovery exceptions.
  • If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.

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Please allow installation to complete without putting your Mac to sleep or closing its lid. During installation, your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.

If your Mac restarts to a setup assistant, but 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.

macOS Recovery exceptions

The version of macOS offered by macOS Recovery might vary in some cases:

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Mac Os High Sierra Download

  • If macOS Sierra 10.12.4 or later has never been installed on this Mac, Option-Command-R installs the macOS that came with your Mac, or the closest version still available. And Shift-Option-Command-R isn't available.
  • If you erased your entire disk instead of just the startup volume on that disk, macOS Recovery might offer only the macOS that came with your Mac, or the closest version still available. You can upgrade to a later version afterward.
  • If your Mac has the Apple T2 Security Chip and you never installed a macOS update, Option-Command-R installs the latest macOS that was installed on your Mac.
  • If you just had your Mac logic board replaced during a repair, macOS Recovery might offer only the latest macOS that is compatible with your Mac.

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If you can't get macOS Recovery to offer the installer you want, you might be able to use one of the other ways to install macOS.

Other ways to install macOS

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  • You can also install macOS from the App Store or Software Update preferences. If you can't install macOS Catalina, you might be able to install an earlier macOS, such as macOS Mojave, High Sierra, Sierra, El Capitan, or Yosemite.
  • Or create a bootable installer disk, then use that disk to install macOS on your Mac or another Mac.