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How to reset mountain lion mac how to#
How to reset mountain lion mac mac os#
How to reset mountain lion mac install#
How to reset mountain lion mac mac#

To do this, you will first need to redownload the Lion installer from the Mac App Store (you can do this by holding the Option key and clicking the Purchases tag, which will give you an option to redownload the installer). As a result you will not be able to use advanced drive encryption options and iCloud's "Find my Mac" feature however, you can still create a Recovery HD partition on another drive to use its tools. If Lion was initially not able to create a Recovery HD partition because your drive setup is unsupported, then you will not be able to create the partition on your boot volume. If your recovery partition is missing, then there are several options you can take to use either it or its functions, but these options will depend on why your partition is missing in the first place: Optionally you can enable the debug menu in Disk Utility, followed by selecting "Show every partition" in this menu to see if the Recovery HD partition gets listed in the tool (it should be grayed out). If your system boots to the recovery tools, then the partition is present. To see if your system contains a Recovery HD partition, you can restart with the Command-R keys held down. With all partitions shown in Disk Utility, you can see whether or not the hidden Recovery HD partition is present on a drive. Unfortunately doing this will only copy the files from your OS X installation and not from other partitions like Recovery HD, so if you have cloned your system to an external drive followed by repartitioning and formatting your internal drive and restoring, then you likely will have removed the recovery HD partition.

While block-level cloning of a drive will preserve its partitions and the data on multiple volumes, this cannot be done on the boot drive so an alternative that is more commonly used is file-level cloning that copies all the files from one volume to another. In addition to unsupported drive configurations, you can inadvertently remove the Recovery HD partition if you format your drive and restore from a cloned backup. If you've installed Lion on a drive with too many partitions or an unsupported RAID array, then while the Lion installer will allow you to continue the OS installation, it will just omit setting up the Recovery HD partition. While this partition should be present on most systems running Lion, in some situations it may be missing.

How to reset mountain lion mac install#

For some older Macs this won't necessarily be the latest OS, such as MacOS Monterey, but instead MacOS Catalina, for example.When you install OS X Lion, the system will create a hidden partition called "Recovery HD." In addition to providing recovery and diagnostics tools similar to those on the older OS X installation DVDs, it is also used for enabling enhanced features in Lion such as Apple's FileVault 2 disk encryption and the "Find My Mac" location service as part of iCloud. Your computer should then install the latest version of OS that it can install.

How to reset mountain lion mac mac os#

Re-install MacOSX: click on " Reinstall Mac OS X" > "Continue".

Select the Mac OS Extended (Journaled), give a name to your disk and click on Erase.

Select the startup disk and go to the Erase Tab.

Select " Disk Utility" and click on Continue.

Turn your Mac on, while holding the CMD + R keys down.

Also, it is advised to make a time machine back up of your computer if possible before following the procedure. To reinstall your Mac's OS without an installation disc you need to firstly make sure that you keep your Mac turned on during the whole procedure, and that your Mac is connected to the internet.

How to reset mountain lion mac how to#

In this article we will show you how to reinstall Mac OS without disc. MacOS includes a recovery partition that allows you to easily erase all data on your Mac and reinstall your OS without an installation disc.