Install Mac OS X 10.7, 10.8 (Lion, Mountain Lion)

   method requires:

• Your Mac had OS X 10.7 (Lion) or 10.8 (Mountain Lion) when it was purchased, you can do a fresh install of the same version.
• If you upgraded your Mac to 10.7 or 10.8 via the Mac App Store, you will need your Apple ID login that was used to purchase the upgrade.
• You will also need Internet connection (wi-fi or wired) to download the operating system from Apple. Preferably a fast one, as the download is larger than 4GB.

Please read these steps before starting, to understand the process and the requirements.

1. Make sure that you made backup copies of the files. You’re about to format the drive, you won’t get them back.
2. Restart the computer, and hold down the “Option” key when the screen turns white. If your computer is has a Recovery partition, you will see an icon for your hard drive, and another for Recovery. Select the recovery partition to boot into it.
                              
3. Select your language.
                              
4. When the you are presented with the OS X Utilities menu, we first need to launch the Disk Utility to erase the contents from the disk.
                             
5. In Disk Utility, Select your Mac’s disk in the upper left hand corner and view the Erase tab. From the drop down box select Mac OS X Exteneded (Journaled) as the format, and give the disk a name.
                            
6. If your Mac is equipped with a Solid State Disk (SSD), you will notice that the “Security Options” button will be greyed out and unavailable. SSDs store data in a different way from traditional hard drive. Apple disabled Security Options for SSDs because they claim that a standard erase will makes data recovery difficult. If however, the Security Options button is availible, go ahead and use it, but it will take a few hours depending on the size of the hard drive and the number of times you want it overwritten.
7. Once the Disk Utility is finished formatting the drive, close it to return to OS X Utilities.
                                
8. Now we are ready to Reinstall OS X.
9. Install Mac OS X  a new hard drive.
   
                                

   Step 1 — Installing Mac OS X

   • Insert a Mac OS X installation disc into your optical drive.
     
   • Hold down the “option” key and restart the computer to bring up the boot option menu.
     
   • To begin the installation, click the install disc icon on the boot option menu.
     
                                 

   
   
   Step 3

   • After the installer loads, you will be greeted by a welcome window.
     
   • Select “Disk Utility” from the Utilities drop down menu.
     
                                     
     Step 5

   • The following two steps are only necessary if your drive's partition is set incorrectly. Erasing a partition will permanently erase all information stored inside.
     
   • Select the partition on the drive and click the "-" button.
     
   • When prompted, click the "Remove" button to remove the drive's existing partitions.
     
   • Once the partitions have been removed, click the "Options..." button.
     
                                     Step 6

   • Select the partition scheme required for your machine:
     
     • Select "GUID Partition Table" for Intel-based machines.
       
     • Select "Apple Partition Map" for PowerPC-based machines.
       
   • Click "Ok."
     
   • Press the "+" button to add a new partition.
     
   • Press the "Apply" button.
     
                                     

    Step 7

   • Click on the “Erase” tab.
     
   • Choose the Volume format (we recommend “Mac OS Extended (Journaled)”).
     
                                        

    Step 8

   • Type in a name for the drive. Apple names their drives "Macintosh HD" from the factory.
     
   • Click “Erase.”
     
                                        

    Step 9

   • A warning window will pop up and ask if you wish to continue with the erasing process.
     
   • Click "Erase" on the warning window that has popped up.
     
   •  Make sure you backup or save all of your personal files and data to an external disk.

                                       

How to Do an Archive and Install for Mac OS X 10.7, 10.8 (Lion, Mountain Lion)

An "archive and install" allows you to reinstall the operating system on your machine while perserving all of your personal data. Reinstalling the operating system may be necessary if it has become corrupted or if you are experiencing certain types of glitches or faults with your computers operation. This article will show you how to do an archive and install on Mac OS X 10.7 Lion and 10.8 Mountain Lion. Just follow the steps below.

BEFORE STARTING:

Make sure the computer is connected to the internet. The internet connection can be via WiFi or ethernet. If the computer is not connected, this process will NOT work.

If using a laptop computer, make sure it is connected to a power source. If the computer battery were to die mid-installation, that could theoretically cause a lot of unwanted issues.

Make sure you backup or save all of your personal files and data to an external disk. This installation process does not require you to do so because erasing files is not part of the process. However, with any major function, there is always a risk of some form of data loss. Perform a backup or file save at your own discretion. If you are unable to save personal files for whatever reason, continue with the reinstallation as this is merely a precaution.

STEPS

1. If your computer is on, restart it. If your computer is off, turn it on.
2. IMMEDIATELY after, or just before, startup, press and hold the command key and the R key simultaneously ("startup" meaning the signature Apple startup sound or "bong").

                                           

3. If done properly, the computer will appear to start as normal. However, a window will eventually appear that is titled OS X Utilities.
4. Select the utility labeled Reinstall OS X. Then click Continue.

                                           

5. A window will appear.

• If you're running OS X 10.7 Lion, the window will show a picture of a lion and say OS X Lion.
• If you're running OS X 10.8 Mountain Lion, the window will show a picture of a mountain lion and say OS X Mountain Lion.

6. Click Continue.

                                           

7. A window will appear saying that your eligability for the reinstall will be verified. Click Continue.
8. The next page is Apple's terms and license agreements. Once you've looked them over, click Agree.
9. A window will appear asking you to verify your agreement with Apple's terms. Click Agree again.
10. Select the hard drive that you want for the OS X reinstall and click Install.

• The drive you want is most likely titled Macintosh HD.
• If only one drive presents itself, just click Install.
• If you don't see the hard drive that you would like to choose, click Show all disks..., select your desired destination, and click Install. If you still can't see your desired hard drive, check cable connections and power supplies.

                                           

11. A window may appear asking you to enter your Apple ID and password. If so, enter your ID and password and click Sign In. If the window doesn't appear, that's also normal.

• The Apple ID and password is the information used to log into the iTunes store or the Mac App Store.

12. The installation process will begin.

• The first step in the process is the software download. This requires an internet connection. Make sure there is a connection to WiFi or ethernet or the installation process will not begin. Your computer will restart several times during the process.

                                          

13. Once the installation is finished, your computer will appear to start as normal. This means the installation was successful.

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