Installed Mountain Lion on ext. drive but doesn't show up on boot

Discussion in 'OS X Mountain Lion (10.8)' started by petrucci666, Feb 18, 2012.

  1. macrumors 6502a

    Joined:
    Apr 30, 2009
    Location:
    San Francisco, CA
    #1
    I hold the Option key on boot but only Macintosh HD and Recovery HD show up, no external drives.

    What am I doing wrong?
     
  2. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #2

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