Chicken and egg 10.8 installation problem

Discussion in 'macOS' started by moosegoose, Jul 3, 2013.

  1. moosegoose macrumors newbie

    Joined:
    Jul 25, 2002
    #1
    Just bought a second-hand 2011 27 inch iMac. (I currently have a 2009 24 iMac)

    I want to wipe it completely and install the latest version of mountain lion (it currently has 10.7.5 on it and the seller did not include any installation disks).

    I'd like to use my Apple ID to download mountain lion directly onto the machine, but the instructions say that I need to erase the disc first to do a clean install. However, this isn't possible as it is the start-up disk and there are no partitions.

    I'm currently using my 2009 24 inch iMac as my main work machine. Can I:
    1. Download the mountain lion installer from the App Store to my 2009 iMac (without installing it here!).
    2. Connect the two machines together in target mode and install Mt lion from the 2009 iMac to the 2011 iMac.

    Is this possible? I can't think of any other way of doing it as I don't have any kind of installation disks. The 2009 iMac only has a snow leopard installer (somewhere).

    Any thoughts greatly appreciated.
     
  2. thejadedmonkey macrumors 604

    thejadedmonkey

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    #2
    Take it to an Apple store. They'll set it up right for you.
     
  3. moosegoose thread starter macrumors newbie

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  4. Bear macrumors G3

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    #4
    Try holding down Command-R while you're booting, this should take you into internet recovery. And from there you'll be able to wipe the disk.

    Your other choice is download 10.8.4 from the App Store and put the installer on a USB stick or SD card.
     
  5. moosegoose thread starter macrumors newbie

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    #5
    And after Internet recovery wipes the disc, what do you see when you press the power button?

    How do you then get to the Apple store and purchase mountain lion?
     
  6. Bear macrumors G3

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    #6
    After you wipe the disk, you can install OS X. No need to hit the power button. But if you power on an iMac with a blank disk, it will go in to Internet Recovery.
     
  7. moosegoose thread starter macrumors newbie

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    #7
    Sorry, what I meant was how will it connect to the app store at that stage since there's no operating system?
     
  8. Bear macrumors G3

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    #8
    That's what the internet recovery is about. It downloads what it needs. It's in the Firmware. It'll even ask you for your Apple ID and password when you go to install OS X.
     
  9. moosegoose thread starter macrumors newbie

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  10. moosegoose thread starter macrumors newbie

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    Jul 25, 2002
    #10
    I've done the command R.

    If I try to erase, via the disk utility, it won't let me as it says ‘can't unmount the disc’.

    If I choose the reinstall Mac OS X lion command the installation destination is greyed out.

    I seem to be stuck in some kind of loop.
     
  11. Bear macrumors G3

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    #11
    Are you sure you held down Command and R while the system was starting? Also, are you trying to erase the correct disk?

    I should've linked this Apple article earlier: OS X: About OS X Recovery
     
  12. satcomer macrumors 603

    satcomer

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    #12
    Then try the steps in the article How to create an OS X 10.8 Mountain Lion install drive to see if you can do it this way. Good Luck.
     
  13. Mr Rabbit macrumors 6502a

    Mr Rabbit

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    #13
    This seems like it would work just fine. If your 2009 iMac has Lion installed then you might consider putting it into Target Disk Mode instead and booting to it's OS from the 2011 iMac but if not then your original idea should work unless I'm overlooking some detail.
     
  14. moosegoose thread starter macrumors newbie

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    #14
    OK.

    Its downloading Lion from somewhere. No ID requuired.
     
  15. Weaselboy Moderator

    Weaselboy

    Staff Member

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    #15
    You are little sideways here. :)

    It is downloading Lion because you booted from Internet recovery, and Apple's servers will see that your serial number came with Lion so they will give that to you free. This is not going to get you Mt. Lion.

    At this point you have two choices. You can let the Lion install complete, then open the App Store app and install Mt. Lion from there. (Did you erase the drive before you started the Lion install?)

    Or you can stop the Lion install and use your other machine to DL Mt. Lion and use this free app with an 8GB USB key to make an installer. Then option key boot to the USB key. Once it starts to the recovery screen use Disk Util to erase the entire disk (select the drive name like 1TB Seagate or whatever... not Macintosh HD) then format to Mac OS Extended. Then go ahead with the ML install.
     
  16. moosegoose thread starter macrumors newbie

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    #16
    Many thanks. That makes sense. It effectively restoring the computer to the state was bought in.

    Just one point of clarification though; when I boot up into Lion for the first time there should be no existing user accounts. As I erased the previous User, every trace of that individual should be gone. correct?

    Then, when I want to transfer from my current iMac, all I need to do is connect the two and use migration Assistant
     
  17. Bear macrumors G3

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    #17
    If you erased the disk, there will be no trace of anything from the previous owner. Also, it should come up and go through setup as if it's a new Mac, including the option to migrate data from another Mac or a Time Machine backup.
     
  18. moosegoose thread starter macrumors newbie

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    Jul 25, 2002
    #18
    That's terrific. It's done exactly that —as promised! Thank you very much.

    The last time I transferred the user account across was when I upgraded my wife's iMac to a new one. Unfortunately, I did something stupid when I created the identity on the new machine. Everything was fine until we attached her backup drive which would not sync with the new identity. (We can access the old data but there are unfortunately now two Time Machine identities on the backup drive which is annoyingly awkward).

    Is there a way to avoid that this time?
     
  19. Weaselboy Moderator

    Weaselboy

    Staff Member

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    #19
    It sounds like what you did last time was create an account on the new machine then AFTER that you ran Migration Assistant. What that does is bring in the old account and you end up with two accounts and the data not where you want it.

    To avoid this run the Migration Assistant at the end of the new install process (it will pop up on its own) and it will import your account. Do not setup and account and then run Migration Assistant.
     
  20. moosegoose thread starter macrumors newbie

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    Jul 25, 2002
    #20
    That sounds pretty much like what I did.

    Hah! Won't make that mistake again. Thank you very much.
     

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