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  1. #1
    What O/S can I install on a Apple iMac Core 2 Duo Mid-2007?
    Was given an old MAC (a Apple iMac Core 2 Duo Mid-2007) with no OS. According to specs, it only has 1gb RAM, so how current can I install on this unit?


  2. #2
    What O/S can I install on a Apple iMac Core 2 Duo Mid-2007?
    pigoo3's Avatar
    Member Since
    May 20, 2008
    Your Mac's Specs
    2011 17" MBP 2.2ghz, 16gig ram, OS 10.11.6
    Rep Power
    The newest macOS version this model iMac can run is 10.11.x (El Capitan)...if it has at least 2 gig of RAM installed.

    If it has no OS installed at need to start by purchasing a macOS 10.6 (Snow Leopard) install DVD...which is still sold at Then you need to purchase mac OS 10.8 (Mountain Lion) also still sold at (this is available via download only).

    If you have a 2nd computer available to you...I believe that you can skip the macOS 10.6 purchase. In this case what needs to be done is:

    - Purchase & download macOS 10.8 (Mountain Lion) onto the 2nd computer.
    - Create a bootable USB stick installer of Mountain Lion on this 2nd computer (Google for procedure).
    - Take the bootable Mountain Lion USB stick installer & boot this mid-2007 iMac from it.
    - Proceed with the Mountain Lion install.

    Once you have the iMac running with macOS 10.8 on's where things get a little tricky. From macOS 10.9 forward...all macOS upgrades were free...and download only. The difficulty soon as a newer OS was released...Apple removed the older macOS version from the Apple servers. Thus if you never downloaded these older macOS versions previously...they will not be available to you via the Apple Store.

    If this is the case...the only way I know of to obtain macOS versions newer than macOS 10.8 (Mountain Lion) via sellers on eBay.

    If you have any other questions...please post.

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  3. #3
    What O/S can I install on a Apple iMac Core 2 Duo Mid-2007?
    pm-r's Avatar
    Member Since
    Oct 16, 2010
    Brentwood Bay, BC, Canada
    Rep Power
    And for all details about that iMac, just select the specific model from this list:
    Apple iMac Specs (All iMac Tech Specs):

    Lots of other upgrade info available at the site as well and some various resources.

    PS: Click the * on some of the headings to display extra details and info.

    - Patrick

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