Upgrading OS X Leopard

Discussion in 'MacBook Pro' started by nampramos, Sep 21, 2013.

  1. nampramos macrumors 6502

    Dec 14, 2010
    I'm having some trouble upgrading the newly formatted Mac from its original OS X Leopard.

    I do not have the SL DVD anymore since I removed the optical drive but I have the dmg I previously generated from it, which I now mounted in an external hard drive and am trying to boot from it.

    What happens is that I get an error saying OS X was not able to install on this computer. It worked fine installing from the external hard drive with Leopard.

    Anyone knows how I could possibly fix this?

    Thanks a lot!
  2. borgqueens macrumors member


    Aug 10, 2013
    If you want to upgrade to mountain lion you can do it from App Store directly


    but I don´t know if that is enabled in Leopard OS, hoping you can
  3. MyMac1976 macrumors 6502


    Apr 14, 2013
    try to restore from the .dmg to a small partition in you main drive then boot from that.

    If you can't de that then you really need access to another computer to either burn the DMG or to create and bootable USB of pick a a linux so you can have access to and create a bootable USG of the DMG or hook up an external DVD drive.

    Methinks removing the optical drive was a bad call.
  4. SadChief, Sep 21, 2013
    Last edited: Sep 22, 2013

    SadChief macrumors regular


    Jan 15, 2010
    Montpellier, France
    This happens when the OS already installed is a subsequent version of the version one tries to install (e.g., you have already 10.5.8 installed and you are trying to install the 10.5.5 version over it).
    In such a case, erasing the HD/SSD drive is mandatory.

    Edit: Should you want a system re-install, applying the 10.5.8 Combo update is highly recommended.

Share This Page