dual boot issue Mountain Lion and Snow Leopard

Discussion in 'Mac Basics and Help' started by swennyhenny, Aug 26, 2013.

  1. macrumors newbie

    Aug 26, 2013
    iMac 27" mid 2010 now running Mountain Lion

    wish to create dual boot Snow Leopard and Mountain Lion to run older scanner and other peripherals.

    Original OS X install disc gives error message "you can't use this version… you have 23.1.1

    Created time machine backup.

    Created bootable Mountain Lion USB

    Created bootable Snow Leopard USB

    Booted iMac from Mountain Lion USB and erased HD

    Attempted to boot from original start up disc but it hangs on Apple logo screen

    Attempted to boot from Snow Leopard USB and hangs at same point

    Attempted to boot from Snow Leopard retail disc and hangs at same point.

    Boots every time from ML USB

    When I boot holding OPTION I can select from 3 different start up discs, but only ML gets past the Apple logo screen.

    What is the reason why the iMac, which shipped from memory with
    Snow Leopard, will now not start up from SL even when the HD has been erased?
  2. macrumors 68030

    Feb 13, 2011
    Baltimore, Maryland
    Where did you buy the iMac? I'm wondering if you've actually got the original installer disk.
  3. thread starter macrumors newbie

    Aug 26, 2013
    iMac came from Apple direct, disc was in the box.

    I'm totally baffled.
  4. macrumors 68000

    Aug 24, 2013
    Far from here

    did you erase "Macintosh HD" or the whole disc ?

    Il you only erased "Macintosh HD", the (Mountain Lion) Recovery HD is still here, and you won't be able to use the Snow Leopard Installer.

    When you erase the WHOLE disc, the Recovery HD will be erased too, thus you will be able to boot from SL Install disc or bootable USB.
  5. macrumors 68030

    Dave Braine

    Mar 19, 2008
    Warrington, UK
  6. thread starter macrumors newbie

    Aug 26, 2013
    Good point, is the WHOLE disc erased?

    Will try this tonight and update.

  7. thread starter macrumors newbie

    Aug 26, 2013
    OK so I've double checked that the entire HD was erased and used the secure zero out option which took a couple of hours.

    All startup discs still hang at the Apple logo screen except ML.

    Going to try target disc mode next with a borrowed Mac.

Share This Page