Formatting a Mac with no optical drive (how to re-install your OS?)

Discussion in 'iMac' started by mlamb64150, Jan 31, 2013.

  1. macrumors member

    Joined:
    Feb 27, 2012
    Location:
    Isle of Man
    #1
    Hi all,

    Apologies if this seems like a dumb question but I don't seem to be able to find an answer on existing topics.

    I have a 2009 MBP and have recently formatted it after 3.5 years of use as it was becoming a little bogged down and slow.

    I recently bought an iMac 2012 and got to thinking about if I was to ever format this (for any particular reason) how would I go about installing Mountain Lion on it again as the system did not come with a recovery/installation disc.

    Any ideas?
     
  2. Moderator

    maflynn

    Staff Member

    Joined:
    May 3, 2009
    Location:
    Boston
    #2
    Just go into the recovery partition on reboot to reinstall (I think its cmd-r on booting up). Mountain Lion uses a recovery partition that is hidden which can be used to boot up. There's also the internet recovery option as well, though I'm not really familiar with that.
     
  3. macrumors 603

    justperry

    #3
    ^^ This, and to boot up in recovery there are two ways, one is to hold Command-R and the other is by holding the Option key.
     
  4. macrumors member

    Joined:
    Dec 10, 2012
    Location:
    Maryland
    #4
    You can make a disk image on a usb thumb drive and install from that.
     
  5. macrumors newbie

    Joined:
    Jul 25, 2010
    Location:
    Boston, MA
    #5
    I happen to be doing this right now! "About 46 minutes remaining"
     
  6. thread starter macrumors member

    Joined:
    Feb 27, 2012
    Location:
    Isle of Man
    #6
    Simple enough! Thanks all :D
     
  7. macrumors newbie

    Joined:
    Jan 9, 2013
    #7
    Just a clarification.

    Command+R will give you the recovery tool from the hard drive.
    Option+Command+R will give you the the recovery tool from the internet.
     
  8. macrumors 603

    justperry

    #8
    Where did I say that, I said hold Option on startup, this will bring you to the boot screen where you can choose.

    I am not aware of a Option+Command+R key sequence, never heard of it and if you google it, it won't find anything.
     
  9. macrumors regular

    Joined:
    Dec 29, 2007
    Location:
    Cape Cod, MA
    #9
  10. KrasHr, Jan 31, 2013
    Last edited: Jan 31, 2013

    macrumors newbie

    Joined:
    Jan 9, 2013
    #10
    Reading comprehension and edit fail on my part, sorry.

    Option+Command+R loads the recovery tools from the internet. You get a globe and a progress bar. Took about 10 minutes to load on an 8Mbit connection the other day, when my hard drive partition table was all screwed up.
     
  11. macrumors 603

    justperry

    #11
    I am not saying I don't believe you but there is nothing on Apple's site about that short-cut.

    Startup key combinations for Intel-based Macs

    OS X keyboard shortcuts
     
  12. KrasHr, Feb 1, 2013
    Last edited: Feb 1, 2013

    macrumors newbie

    Joined:
    Jan 9, 2013
    #12
    Short story. I had partition table issues, applecare person told me to use the option+command+r shortcut until I saw a spinning globe to try to rectify the issue via the Internet Recovery Tools.
     
  13. macrumors regular

    Joined:
    Dec 29, 2007
    Location:
    Cape Cod, MA
    #13
    I was thinking you were correct until i saw this in the Fusion Drive FAQ on apple's support site
    http://support.apple.com/kb/HT5446

    Near the end is this little tidbit

    emphasis added

    can't believe they buried that info so deep and dont have it listed in the startup key combinations you linked to...
     
  14. macrumors 603

    justperry

    #14
    That's why I said I don't believe you(Him-KrasHr).
    Strange they don't have this on the shortcut page, well at least I know it is true now.


    So you were right, as above, odd Apple buries this shortcut somewhere else.
     

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