Format mac and reinstall mountain lion

This will cause your Mac to display its built-in startup manager, which will allow you to select the device you want to boot from. Use the arrow keys to select the bootable Mountain Lion installer you created earlier, then press the enter key to start the boot process. That's why we made our own bootable media. Select Disk Utility from the list of options, and click Continue. When Disk Utility opens, select your Mac's startup volume from the list of devices. If you never changed its name, the startup volume will be listed as Macintosh HD.

Be sure to select the volume name and not the device name, which will usually be the name of the physical drive, for instance, " GB WDC WD5. You can give the startup drive a name, or use the default name.

Perform a Clean Install of OS X Mountain Lion on Startup Drive

Click the Erase button. You'll be asked if you are sure you want to erase the drive. Click Erase. The Install OS X window will open. Click Continue. A sheet will drop down, informing you that your computer's eligibility will be verified before you can download and restore OS X. This happens because the bootable media we created doesn't contain all of the files necessary for the install.

The installer will check for any missing or new files it needs, download the files from Apple's servers, and then start the installation process. Read through the license, and click the Agree button. You'll need to click the Agree button a second time, just to make sure you really agree with the license and didn't accidentally click the Agree button the first time. The installer will display a list of drives that you can install Mountain Lion on. Select the target drive the startup drive you erased in the steps above , and click the Install button.

The installer will check the Mac App Store for updates and any other files it needs. After your Mac reboots, a progress bar will display the time remaining in the installation.

Reinstalling Mountain Lion

This will vary, depending on the Mac, but it should be relatively short, less than 30 minutes in most cases. When the progress bar hits zero, your Mac will automatically restart. After restarting, your Mac will start the system setup process, including creating an administrator account, creating an iCloud account if you want one , and setting up the Find My Mac service if you choose to use it. The Welcome screen will display. Select your country from the list, and click Continue. Select your keyboard layout from the list, and click Continue.

You can choose to transfer user data, applications, and other information from another Mac, PC, or hard drive; you can also choose not to transfer data now. I recommend selecting the Not Now option. You can always transfer data later using the Migration Assistant included with the OS. This lets you ensure that your Mac is up and running with Mountain Lion without any issues before you spend the long time it takes to transfer data. Make your selection and click Continue.

This feature allows your apps to figure out your approximate location and then use that data for various purposes, ranging from mapping to advertising. You can enable location services at any time, so you don't have to decide now. Make your selection, and click Continue. The installer will ask for your Apple ID.

You can skip this step if you wish, but if you supply the information now, the installer will pre-configure iTunes, the Mac App Store, and iCloud. It will also pull account information you have provided in the past to make the registration process easier. Make your selection, and click Skip or Continue. Read through the information, and click Agree. You know the drill; click Agree again. You can allow the installer to set up iCloud on your Mac. You can also do this yourself later, but if you plan to use iCloud, I recommend letting the installer take care of the setup process.


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If you chose to have the installer set up iCloud, your contacts, calendars, reminders, and bookmarks will be uploaded to and stored in iCloud. You can set up Find My Mac, a service that can use location services to determine where your Mac is if you've misplaced it or it's been stolen. With Find My Mac, you can also remotely lock your Mac or erase its drive, which is handy for lost or stolen Macs. If you chose to set up Find My Mac, you'll be asked if it's okay for Find My Mac to display your location when you attempt to locate your Mac.

Click Allow.

How to reinstall Mac OS X from scratch

The next step is to create your administrator account. Enter your full name. The account name defaults to your full name, with all of the spaces and special characters removed.

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The account name is also all lowercase letters. A clean install will give you peace of mind. With that cleared up, in this article we will show you how to erase existing data and reinstall a brand new copy of Mountain Lion. Here is a breakdown of the steps involved:. Recommended Reading: First, grab hold of a copy of the Mountain Lion installer file. Re-enter your App Store credentials if required.

Note that this may take up between 10 and 60 minutes, depending on your Internet connection speeds. Do not start the installation process when your download finishes.

Our goal is here to keep a soft copy of the installer and in the flash drive. Double-click InstallESD.

The Safe Mac » How to reinstall Mac OS X from scratch

This may take a minute or two. Plug in the flash drive into your Mac and launch the Disk Utility application. You can do it quickly by searching via Spotlight. This will remove everything in the flash drive. Keep a backup of the files within if you still need them, then come back to this section.