Cannot boot 2012 Macbook Air from external HD

Discussion in 'MacBook Air' started by Globe199, May 16, 2012.

  1. Globe199 macrumors member

    Aug 6, 2009
    Long story short, I had to wipe the internal HD on my 2012 Macbook Air, including the recovery HD. I tried twice to boot to Apple's Recovery Console (using Command+R), but it failed both times with error 2003F. Apple phone support had no idea what that meant. Wow.

    Anyway, I tried booting from an external HD that has Lion installed from a corporate disc image. It's not an install disk, it's the actual installed OS. All I get is the empty-set symbol (circle with diagonal line thru it) when I choose the boot device. Nothing works. I also tried booting from the "Recovery HD" on the external drive. I'm now going to try booting from an external DVD drive; I'm not optimistic.

    Any suggestions? I'd rather not hike back to the Apple store.
  2. gentlefury macrumors 68030

    Jul 21, 2011
    Los Angeles, CA
    I'm guessing you mean a 2011 MBA, since the 2012s aren't out yet.

    I have actually booted from an external disk I yanked out of my Mac Mini and it worked fine. Do you have a time machine backup you can use...that's the easiest thing to use to recover Lion that I have need for an install image or internet connection to do it.
  3. Globe199 thread starter macrumors member

    Aug 6, 2009
    OK, 2011. No time machine, it's a brand new machine, bought last week.
  4. halledise macrumors 65816

    May 7, 2009
    Hamilton Island, Whitsundays, QLD Australia
    go here - - and download the tool to another Mac running Lion

    you can install it onto a usb stick.

    then insert the stick into your errant MBA and hold down the option key as you startup.
    you should be sweet to go from there … re-downloading Lion and your other apps from the App Store (if you don't already have 'em on a backup disc)
  5. alphaod macrumors Core


    Feb 9, 2008
    Can you take it to an Apple Store or reseller to have take a look at it?

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