Mac os mountain lion wont start from command r

#Mac os mountain lion wont start from command r how to#
#Mac os mountain lion wont start from command r install#
#Mac os mountain lion wont start from command r upgrade#
#Mac os mountain lion wont start from command r full#

Installing a fresh copy of macOS via Recovery ModeДЇor the majority of Mac users, reinstalling macOS means booting into Recovery Mode: Once the process is complete, select вЂQuit Disk Utility,вЂ™ to return to the main macOS Utilities window.

Disk Utility will now wipe your hard drive.

Select the volume that you want to erase.

If you do decide to wipe the slate clean, then as soon as you encounter the macOS Utilities window, make sure you:

#Mac os mountain lion wont start from command r how to#

In this article, IвЂ™ll show you how to reinstall macOS via Recovery Mode, and via Internet Recovery вЂ“ just in case your Mac is missing a recovery partition! However, regardless of whether you reinstall via Recovery or Internet Recovery, at some point youвЂ™ll have access to the macOS Utilities menu, which contains a вЂDisk UtilityвЂ™ option that you can use to wipe your hard drive. You may even want to consider actively wiping your data before reinstalling macOS, especially if you plan to sell your Mac, or donate it to a lucky friend or relative. Reinstalling macOS shouldnвЂ™t delete your data, but itвЂ™s always best to be on the safe side! The pre-10.12.4 option is simply Command-Option-R, but it acts like the new Shift-Command-Option-R, installing the shipped OS or the oldest compatible version.Before reinstalling the operating system, make sure youвЂ™ve backed up any files or data that you want to hang onto.

#Mac os mountain lion wont start from command r install#

(Apple just changed this behavior with 10.12.4, but if youвЂ™re using Internet Recovery for a clean install on an erased drive, the new behavior should be active as it will be pulled from the version of Recovery thatвЂ™s bootstrapped from AppleвЂ™s servers. Apple also offers Shift-Command-Option-R, which installs the version of OS X or macOS with which your computer shipped, or the next oldest compatible system still available for download. While Command-R at startup always installs whatever the most recent version you installed on your Mac, holding down Command-Option-R brings down the very latest compatible version that can be installed. However, if you have normal Recovery installed and it refuses to install macOS for some reason, you can manually invoke Internet Recovery.

#Mac os mountain lion wont start from command r full#

There, the Mac reaches out over a Wi-Fi or ethernet connection to download the relatively modest Recovery software, which then bootstraps the download of the full macOS installer.ДЄpple says Internet-based Recovery should happen automatically on supported models, and you should see a spinning globe when that mode is invoked while the download occurs.

#Mac os mountain lion wont start from command r upgrade#

However, thereвЂ™s yet another option: macOS Recovery over the Internet, which requires either a Mac model released in 2012 or later, or most 20 models with a firmware upgrade applied. When complete, it installs it and reboots, and places the installer in the Applications folder. (Apple doesnвЂ™t document that, and I havenвЂ™t had to test that for years.)ДЇailing finding it, Recovery downloads the currently installed version of macOS (or OS X), which is about 5GB.

In that mode, when you choose to reinstall without erasing the drive, my recollection is that Recovery looks for the current OS system installer on your startup disk in the Applications folder, and uses that. That allows you to run Disk Utility, reinstall or wipe and install the system, access Terminal for command-line functions, and so on.

Normally, you can start up a Mac while holding down Command-R to boot into what Apple now calls macOS Recovery. But if you canвЂ™t get access to another Mac or the necessary drive, itвЂ™s still possible to use a different Recovery mode on all recent Macs, dating back to 2010.