Mac OS X 10.8 Mountain Lion Full OS Install - Reinstall/Recovery Upgrade Downgrade/Repair Utility Factory Reset Disk Drive Disc CD DVD v. 10.8.5 Utility

[Music] hi i'm jonathan damage here - brains - Lionel mountain line on your Mac we started computer and hold down the command in R K this will move into the crabby petition what you'll get is this menu it's the OS X utilities menu and will be able to restore from Time Machine backup or you can click on the disabilities and you can repair or array that this what we have to do to install a clean system is first it's Xfinity select continue and you'll have all the hard drives connected to your device we're set the hard drive click arrange to wipe the drive we're just type the partition in and if we click a raise and create that partition yep so there let's quit just create that partition and that's gonna be a clean there's nothing on the hard drive now so now we'll need to go back out and reinstall from the Internet's what this does going to continue this will download all these components