What does verbode mode actually tell you?

Discussion in 'macOS' started by komatsu, Nov 24, 2016.

  1. komatsu macrumors 6502

    Joined:
    Sep 19, 2010
    #1
    I am troubleshooting a non-booting OS X (Sierra) here and put it into Safe / verbose mode.

    There is a lot of output from verbose mode but what should I be looking for in terms of finding
    the problem file which is causing the boot problem?

    There is a lot of output from verbose mode - what should I be looking for?
     
  2. komatsu thread starter macrumors 6502

    Joined:
    Sep 19, 2010
    #2
    sorry that should read:

    What does verbose mode in OS X actually tell you?
     
  3. KALLT, Nov 25, 2016
    Last edited: Nov 25, 2016

    KALLT macrumors 601

    Joined:
    Sep 23, 2008
    #3
    Why not post a screenshot? Much easier. ;)

    I believe the log is also kept in /var/log/kernel.log after a verbose boot, so you might want to post the output here from the Console app.
     
  4. mysteryGenius macrumors member

    mysteryGenius

    Joined:
    Nov 24, 2016
    Location:
    UK
    #4
    take a pic of the part it hangs on and upload it.

    ill take a look
     
  5. komatsu thread starter macrumors 6502

    Joined:
    Sep 19, 2010
    #5
    File uploaded now.

    Hoping someone can shed some light on this.

    BTW, this is the screen where bootup halts.
     

    Attached Files:

  6. MacUser2525 macrumors 68000

    MacUser2525

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    Mar 17, 2007
    Location:
    Canada
    #6
    Going by all the Battery lines there I would say it is dead or in the process of dying off.
     
  7. mysteryGenius macrumors member

    mysteryGenius

    Joined:
    Nov 24, 2016
    Location:
    UK
    #7
    Is that battery polling thing the last line it displays or is there anything after that?

    A failing or failed battery will not cause any problems with the startup process.

    More likely to be the 'kextd wait' line that's causing it.

    Have you installed or updated any software recently? Does it start up or at least go further in safe mode? (Hold down shift when powering on)
     
  8. komatsu thread starter macrumors 6502

    Joined:
    Sep 19, 2010
    #8
    no new software installed recently.

    That is as far as system goes.

    It is my suspicious also that the 'kextd wait' is the cause. Anybody know what this could be?
     
  9. DeltaMac macrumors G3

    DeltaMac

    Joined:
    Jul 30, 2003
    Location:
    Delaware
    #9
    Hmm...
    I would suspect first that there is a problem with the power manager.
    Try an SMC reset.
     
  10. mysteryGenius macrumors member

    mysteryGenius

    Joined:
    Nov 24, 2016
    Location:
    UK
    #10
    SMC won't cause a boot issue like that but can't hurt to try.

    Try clearing out anything from the following directories:

    /Library/LaunchAgents
    /Library/LaunchDaemons

    ~/Library/LaunchAgents

    DO NOT TOUCH ANYTHING IN /System/Library/

    Once those folders are cleared try another safe boot.
     
  11. komatsu thread starter macrumors 6502

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    Sep 19, 2010
    #11
    ok how do I use delete these when the system is not booting?
     
  12. mysteryGenius macrumors member

    mysteryGenius

    Joined:
    Nov 24, 2016
    Location:
    UK
    #12
    You need to either start from an external OS or use Single User mode to delete them.

    To use single user mode, start the machine holding CMD+S. It will look like verbose mode but will stop at a command prompt.

    At this prompt type the following lines EXACTLY, press Return at the end of each line (when you hit return you should get a new blank line with no errors, if you don't, try again).

    mount -uw /
    rm -rf /Library/LaunchAgents/*
    rm -rf /Library/LaunchDaemons/*
    shutdown -r now

    When the machine restarts hold down the Shift key at the chime until you see the apple logo.

    PS. Messing things up in Single User mode will almost certainly cause more harm than good so tread carefully!
     
  13. komatsu thread starter macrumors 6502

    Joined:
    Sep 19, 2010
    #13
    I tried this.

    All commands executed without error.

    But, unfortunately, the MacBook cannot boot.

    This problem seemed to have coincided with the system being in
    Target Disk Mode.

    Any more suggestions would be appreciated.
     
  14. KALLT macrumors 601

    Joined:
    Sep 23, 2008
    #14
    You don't need to disable launch agents. Booting into safe mode takes care of that (shift key).

    Can you boot into recovery?
     
  15. komatsu thread starter macrumors 6502

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    Sep 19, 2010
  16. komatsu thread starter macrumors 6502

    Joined:
    Sep 19, 2010
    #16
    Ok here is an update.

    Did a clean re-install of Sierra and then using Migration Assistant brought over
    Applications
    +
    Data
    +
    Settings

    Guess what...EXACT same problem

    So again back to the drawing board. I wiped HDD again and did another re-install. Boots up perfectly now
    but data still needs to be migrated over from the backup disk.

    So to prevent problem again, what do I NOT migrate over (using Migration Assistant) ?

    a) applications
    b) data
    c) settings
     
  17. mysteryGenius macrumors member

    mysteryGenius

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    Nov 24, 2016
    Location:
    UK
    #17

    You will have to try a process of elimination but I would start with settings.
     
  18. komatsu thread starter macrumors 6502

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    Sep 19, 2010
    #18
    ok, so what will I lose if "settings" are not migrated over?
     
  19. KALLT macrumors 601

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    Sep 23, 2008
    #19
    Just the system-wide settings in /Library, probably also the stuff in /etc. I think you can at least move over the user directory, probably also the applications.
     
  20. komatsu thread starter macrumors 6502

    Joined:
    Sep 19, 2010
    #20
    ok thanks Kallt, but these are system-wide settings like what? Can you give an example?
     

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