How to remove Windows only operating system.

Discussion in 'Windows, Linux & Others on the Mac' started by TheColonist, Mar 22, 2013.

  1. TheColonist macrumors newbie

    Mar 22, 2013
    I purchased an iMac 20" computer. The previous owner (deceased) formated the hard drive and installed Windows 7 ONLY. I researched and found out I the computer can handle Snow Lepard, but it needs to be installed from OS X. If i purchase the Full Install of Tiger (the original OS), how do I go about installing it? Do I format the hard drive form Windows 7? Not sure what to do. Afraid to do anything for fear of destroying it completely.
  2. TiBook550 macrumors member

    Jan 6, 2004
    Atl, GA
    - Back up any info you want to save from the hard drive.
    - Boot from the Tiger install disc by holding down the C key at startup.
    - At the install screen, select Disk Utility from Applications>Utilities.
    - Select the hard drive in the left column and click the Erase tab.
    - Choose Mac OS Extended (Journaled) as the volume format, rename the drive, check the box if you're installing OS 9 (doubtful) and then Erase.
    - Quit Disk Utility and proceed to install OS X as normal.
  3. Acorn, Mar 23, 2013
    Last edited: Mar 24, 2013

    Acorn macrumors 68020


    Jan 2, 2009
    delete the windows partition
    create a new partition osx extended journaled
    then choose options and select GUID partition

    you need to choose options and set up your partition as a GUID partition otherwise the partition will not be bootable from osx.
  4. TheColonist thread starter macrumors newbie

    Mar 22, 2013
    Which OS?

    I don't have the Tiger disks, but I did get the Snow Leopard disk. Do I need to install Tiger first, or can I install SN instead?
  5. ddmcnair macrumors member

    Apr 25, 2011
    Install whatever OSX disc you have. Once installed you can start upgrading the versions. Have fun; keep us posted.:apple::)
  6. maflynn Moderator


    Staff Member

    May 3, 2009
    The thread is three years old, I'm sure he's already moved on from the issue and there's nothing to keep us posted about.

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