Before selling your Mac, it’s always a good idea to wipe its startup disk clean and then erase your computer and reinstall OS X. And should your computer exhibit issues preventing it from starting up properly, reinstalling OS X will bring it to perfect working order.
Reinstalling OS X is a piece of cake provided you have created a USB install disk for El Capitan to begin with. As you may have guessed, not many people take that extra step.
In helping take the pain out of reinstalling OS X, Apple has included so-called Recovery Mode in OS X. Invoked at boot time, Recovery Mode helps you check your connected disks for errors, get help online and reinstall OS X.
This tutorial covers entering Recovery Mode and taking advantage of it to erase, install or reinstall the latest version of OS X that was previously found on your Mac.... Read the rest of this post here
"Installing or reinstalling OS X in Recovery Mode" is an article by iDownloadBlog.com.
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