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Can't Boot Into safe mode mountain lion

5592 Views 22 Replies Latest reply: Mar 8, 2013 7:19 AM by Rob Mitchell1 RSS
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gpinnyc Level 1 Level 1 (0 points)
Currently Being Moderated
Jan 2, 2013 5:45 AM

Have a oct 2009 Power Mac with ML on it (latest updates) Machine cant' boot into safe mode. Did a reinstall...still no luck. One theory, i have a secondary HD for data that is a software mirror. I heard if the boot drive is a software mirror, safe mode won't work (not confirmed with Apple). Anyone aware of this fact AND do you think having an alternate drive

Mac Pro, OS X Mountain Lion (10.8.2), 8GB RAM
  • Linc Davis Level 10 Level 10 (107,985 points)
    Currently Being Moderated
    Jan 2, 2013 10:51 AM (in response to gpinnyc)

    It's true that you can't safe-boot from a software RAID, but if I understand, that's not what you're trying to do.

     

    If you're using a wired keyboard connected to a hub, connect it to a built-in USB port and try again. If you're using a wireless keyboard, try a wired one.

     

    Otherwise reset the NVRAM:

     

    About NVRAM and PRAM

  • Linc Davis Level 10 Level 10 (107,985 points)
    Currently Being Moderated
    Jan 2, 2013 11:36 AM (in response to gpinnyc)

    Other reasons for not being able to use safe mode include activating FileVault and setting a firmware password. If neither of those applies, you may be able to force a safe boot independently of the keyboard by entering the following shell command:

     

    sudo nvram boot-args="-x"

     

    Caution: this may make your system unbootable except in single-user mode, or maybe even in single-user mode. In that case, reset the NVRAM again. Otherwise reverse with

     

    sudo nvram boot-args=""

  • Linc Davis Level 10 Level 10 (107,985 points)
    Currently Being Moderated
    Jan 2, 2013 11:54 AM (in response to gpinnyc)

    At worst you will have to boot in single-user mode to clear the boot-args variable, or failing that, reset the NVRAM. At least that's how it should be. Since something is apparently wrong with your system, I can't be sure what will happen.

  • Linc Davis Level 10 Level 10 (107,985 points)
    Currently Being Moderated
    Jan 2, 2013 1:45 PM (in response to gpinnyc)

    You seem to have a damaged secondary boot volume. I doubt that would stop you from booting your primary volume in safe mode, but maybe I'm wrong. Reinstall the OS on the secondary volume and see what happens.

  • Linc Davis Level 10 Level 10 (107,985 points)
    Currently Being Moderated
    Jan 3, 2013 9:28 AM (in response to gpinnyc)

    A software RAID can be bootable. I don't know what's on the volume, so I suggest you erase it and restore only the data you know you need on it from a backup.

  • Linc Davis Level 10 Level 10 (107,985 points)
    Currently Being Moderated
    Jan 3, 2013 10:37 AM (in response to gpinnyc)

    You can install OS X on a RAID without a Recovery partition:

     

    OS X: "Some features of Mac OS X are not supported for the disk (volume name)" appears during installation

     

    To repeat, I don't know what's on the volume. Does it have a System folder? If so, delete that.

  • Linc Davis Level 10 Level 10 (107,985 points)
    Currently Being Moderated
    Jan 3, 2013 10:50 AM (in response to gpinnyc)

    You could not possibly have installed Xcode on the volume unless it was bootable. We seem to be going in circles, and you're not providing any more information, so I don't have anything to add. Good luck.

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