There are now two ways to start Recovery Mode and the method you use depends on which Mac you own.I'm using IMac OSX mountain lion 10.8.5 and when I started up my computer today it didnt enter my desktop like it should. You are having problems with your internet connection.You want to restore from a Time Machine backup.Or you want to erase your disk for another reason….Or you want to do a clean install of macOS – this could fix issues that might be slowing down your Mac, for example.How to reinstall macOS using Recovery Mode. You are encountering problems with a particular version of macOS and want to go back an older version.Or Disk Utility was unable to repair the issue with your drive….There is an issue with your disk and you want to use Disk Utility to repair it.You need to troubleshoot problems, such as failure to start up.Note that there is a new way to wipe your Mac in Monterey, which we investigate in that tutorial as well. How to wipe your Mac and restore it to factory settings. macOS Recovery will allow you to wipe your Mac, removing your data and your Apple ID. You need to wipe a Mac because you want to sell it or pass it on to a new user.

It is a useful tool that the majority of Mac users will never need to use, unless one of the following applies:

This Recovery HD partition contains the latest version of the macOS you installed on your Mac and makes it possible to troubleshoot issues with your Mac. MacOS Recovery (often referred to as Mac Recovery Mode) was introduced back in 2010 with OS X 10.7 Lion.

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