iMac Complete Reinstall

Discussion in 'iMac' started by photogpab, Apr 19, 2013.

  1. photogpab macrumors 6502


    Jun 21, 2010
    I cant find any of the discs that came with my iMac. How can I completely erase and perform a brand new intall. wipe everything out.
  2. simsaladimbamba

    Nov 28, 2010
    It depends on what Mac you have.

    If you have Mac OS X 10.6 Snow Leopard:

    To find out, what exact Mac model you use, click :apple: > About This Mac > More Info > Hardware Overview:
    To see a more elaborate image explaining the above steps, click here.
    To see a more detailed video tutorial showing the above steps, click here (2 MB, 23s, .mp4).​

    If you have Mac OS X 10.7 Lion or OS X 10.8 Mountain Lion, go to :apple: > About This Mac > More Info > System Report or Applications / Utilities / System Information.

    We are interested in the MODEL IDENTIFIER. And also tell us what Mac OS X version you use.
  3. Weaselboy Moderator


    Staff Member

    Jan 23, 2005
    I see from your previous posts you are on Mountain Lion on a 2011 iMac.

    So just command-r boot to the recovery partition then start Disk Utility and erase Macintosh HD. Quit Disk Utility then click install OS. This will take some time as the entire 4.7GB OS needs to be downloaded from Apple's servers.

    Make sure you have a backup before you do this as it will wipe all your data.
  4. macalec macrumors 6502

    Mar 12, 2012
    You can simply press the "Option" key when booting up, select the Recovery partition, and erase the drive using Disk Utility, and then you can install back on the erased volume.

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