Cannot run MacBook PRO HDD on MacBook Retina

Discussion in 'OS X Mountain Lion (10.8)' started by stefanph, Nov 26, 2012.

  1. macrumors newbie

    Nov 26, 2012

    I have the harddisk of my old 2010 Macbook Pro and if I connect it with any other macbook I can boot the mac from that external device while holding 'alt' while starting the machine.. guess you know that. But I have got my new Macbook Pro Retina and it shows me just a restriction sign when I want to boot the retina machine from the external old macbook pro hdd.

    What can I do to start it anyways?

  2. macrumors Core


    Jan 23, 2005
    The Retina runs a special version (build) of Mountain Lion that you do not have on the Pro... so it won't work.
  3. thread starter macrumors newbie

    Nov 26, 2012

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