Need help re-installing OSX from flash drive

Discussion in 'MacBook Pro' started by awj, Nov 20, 2012.

  1. awj macrumors newbie

    Nov 1, 2012
    I recently bought my first MacBook Pro. Upon advice from friends I bought the base model, chose my own SSD and extra RAM with the intention of installing these myself.

    So I downloaded the installer for Mountain Lion as per many guides on the web. I've extracted the installer from the DMG onto a USB flash drive.

    I've now installed the new, clean SSD, inserted the flash drive, powered up and held the Option key.

    As anticipated I get the drive option screen showing the flash drive labelled as "Max OSX".

    However, this is when things start to veer off course.

    When I click on the Mac OSX option I'm taken to a new screen showing the Apple logo, the mouse pointer becomes a spinning icon, and after a few seconds the Apple logo becomes a grey 'no entry' sign, i.e. a circle with a diagonal line.

    I've tried it twice now and have left it for atleast 30 mins both times.

    Can someone please explain what's wrong (if indeed something is wrong) and what I need to do?

    Oh, one other thing is that almost immediately after going to the screen after the drive options, the light on the flash drive turns off and never comes back on. It's a USB 3 flash drive, but it's the same one that I used on the same machine to extract the installer from the DMG file.
  2. T5BRICK macrumors G3


    Aug 3, 2006
    Depending on when your MBP was built, it may not need a USB drive to restore. I'm pretty sure anything built after 2011 can use Internet recovery. 2010 models can also, but they needed a firmware update.
  3. awj thread starter macrumors newbie

    Nov 1, 2012
    Job done

    Thanks @T5BRICK - worked perfectly.

    ...and I spent several hours messing around trying to get the installer onto a flash drive too.

    Just a note to anyone else who uses this method: ensure that your new drive is formatted and has a partition. You can do this using the Disk Utility which loads as an option when you boot into Internet Recovery.

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