Failed boot up sequence after initial install

Discussion in 'macOS Sierra (10.12)' started by nic2051089, Jul 8, 2016.

  1. nic2051089, Jul 8, 2016
    Last edited: Jul 9, 2016

    nic2051089 macrumors newbie


    Jul 8, 2016
    I am hoping someone can help me trouble shoot my failed beta install. I have not been able to launch the computer at all since downloading and initially installing Sierra.

    I did try using the option key to select my external backup drive, and connecting to wifi. But I am not able to get to any other screens successfully.

    I've seen a single white no signal, a large symbol with a lighting bolt arrow, and a text screen in multiple languages saying the system shut down because of an error and will restart.

    The main screen I think has the most information is one I don't know how to interpret. But it gives diagnostics.

    I appreciate the help!
  2. grahamperrin macrumors 601


    Jun 8, 2007

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