iMac mid 2011 SL downgrading problem

Discussion in 'iMac' started by km9898, Sep 23, 2012.

  1. km9898 macrumors member

    Joined:
    Oct 4, 2011
    #1
    Hi there!

    I have a iMac 27 i7 3,4ghz mid-2011 and it was shipped with Lion.

    I do wanted to have SL installed instead of Lion and end up with installing with restore option with a 10.6.8 DMG restore via Disk Utility, and it worked.

    I had SL without any problems til today, when i boot up imac i have the famous "ACPI" boot kernel panic (it seems to be a problem with the thunderbolt update that is causing this)

    Now i see that everyone say that i should re-install SL and then re-do all updates but ignore the Thunderbolt update. But when i insert 10.6.3 retail disk then i get 3 beeps and cant start the install.

    Does anyone know if my iMac can boot from 10.6.8 install disc, and if so, how can i get it as a installer disc?
     
  2. fastlanephil macrumors 6502a

    fastlanephil

    Joined:
    Nov 17, 2007
    #2
    I would advise running the OS that it shipped with or later. I tried using a older version of 10.7 that I had mirrored to my external HD from my 2007 iMac and had serious problems.
     
  3. chevalier433 macrumors 6502a

    chevalier433

    Joined:
    Mar 30, 2011
    #3
    Burn 10.6.8 dmg in a DVD or a USB stick restart from it format your mac hard drive install done.
     
  4. km9898 thread starter macrumors member

    Joined:
    Oct 4, 2011
    #4
    Yeah i know that i can format my disk and use a DMG 10.6.8 to get back to it but i have installed so much things and i have a time machine over the time since my iMac crashed. When i try to restore from it (tried with a few dates) i get the same error.

    Therefore, my only option is to reinstall my Snow Leopard but i need to start the installation disc from version 10.6.8 (and not 10.6.3 which are my retail DVD). So how can i create a disc or boot from a source that have 10.6.8 install?
     
  5. chevalier433 macrumors 6502a

    chevalier433

    Joined:
    Mar 30, 2011
    #5
    As i told you burn 10.6.8 dmg on a DVD and use it as an installer DVD
     
  6. km9898 thread starter macrumors member

    Joined:
    Oct 4, 2011
    #6
    Yeah i burned it down and tried but when i boot it up from the DMG file its only the spinning wheel.

    I don't get it how the DMG can be a installer DVD when it only contains a image file of an already installed osx 10.6.8 drive.

    Anyone?
     

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