Can not boot from USB Mac OS 10.10

Discussion in 'OS X Yosemite (10.10)' started by hoanghn2908, Oct 17, 2014.

  1. hoanghn2908 macrumors newbie

    Joined:
    Oct 17, 2014
    #1
    Hi everyone, i am using mac 10.9.5. I had downloaded Mac OS 10.10 from apple store, i restored it to a USB. And after that i do a clean install but when i press option. they do not show the USB? i can not boot from USB. Anyone can help me? Thank

    PS : my mac is macbook pro 15 mid 2012
     
  2. bmac89 macrumors 6502a

    bmac89

    Joined:
    Aug 3, 2014
    #2
    I have the same problem with my macbook 2010. It won't show or boot from usb drive when holding option at startup. However it works fine on my Imac.

    The only way I have been able to boot from an external usb drive on my macbook is to boot up the internal OS then go to System Preferences > Startup disk - choose usb drive and click restart.
     
  3. tywebb13 macrumors 68020

    Joined:
    Apr 21, 2012
  4. hoanghn2908 thread starter macrumors newbie

    Joined:
    Oct 17, 2014
    #4
    i am trying the way you tell me. hope it work. apple take more our control to do what we want with our mac

    ----------

    i restore the usb by Disk Utility, i see no error. but when start up i hold option button, it not show my USB to install.
     
  5. tywebb13 macrumors 68020

    Joined:
    Apr 21, 2012
    #5
    Well don't restore with disk utility.

    Use my instructions instead.
     
  6. hoanghn2908 thread starter macrumors newbie

    Joined:
    Oct 17, 2014
    #6
    ok i am trying your way. hope it work
     
  7. hoanghn2908, Oct 17, 2014
    Last edited: Oct 18, 2014

    hoanghn2908 thread starter macrumors newbie

    Joined:
    Oct 17, 2014
    #7
    hey i work well for me. thank. but i have a question with file dmg which download from torrent, when i mount it, how to write the command restore it. Thank

    PS : usb will name Untitled
     

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