UPS preventing MacPro from booting

Discussion in 'Mac Pro' started by msbc, Jan 26, 2016.

  1. msbc macrumors newbie

    msbc

    Joined:
    Jul 27, 2011
    Location:
    Melbourne, Australia
    #1
    I'm having some boot issues with my 5.1MP. It's powered by a UPS and connected by USB cable. Sometimes when I boot - both cold and warm - I see the apple logo and grey progress bar only makes it half way before the Mac shuts down. Checking log I see:
    UPS: Shutting down due to power loss!

    Anybody else experienced this issue?

    Thanks,
    Mark
     
  2. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #2
    May be better to remove the UPS if it cause problem.
     
  3. bogg macrumors 6502

    bogg

    Joined:
    Apr 12, 2005
    Location:
    Sweden
    #3
    There was a thread a few weeks back, was due to some ups associated kext not being compatible with El Capitan or something like that (iirc)
     
  4. DanielCoffey macrumors 65816

    DanielCoffey

    Joined:
    Nov 15, 2010
    Location:
    Edinburgh, UK
    #4
    What model and capacity of UPS is it and how old is the battery?
     
  5. msbc thread starter macrumors newbie

    msbc

    Joined:
    Jul 27, 2011
    Location:
    Melbourne, Australia
    #5
    Hmmm, that might be worth looking into. This has only started happening in the last few months - I've had the UPS since December 2014 - CyberPower 1500 VA / 900 Watts. Maybe it aligned with updating to EL?
     
  6. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #6
    You probably already know this, but I'll mention it anyway on the off-chance that you don't...what's happening is that OS X thinks it's getting the "hey the power is out, so shut down safely before the battery runs out" message from the UPS.

    I don't know what's causing this--perhaps the bad KEXT as mentioned above. But in the meantime you can unplug the USB connection as a temporary fix so you can boot up reliably until the underlying problem is solved. You'll still have UPS battery backup, it just won't shut down automatically.
     

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