George Garside Blog

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Causes of shutdown on OS X with explanations for what they mean and how to fix them.

  • 5
    Correct Shut Down.
    Shutdown was initiated, from the OS X Shut Down menu or other shutdown command.
  • 3
    Hard shutdown.
    Check power button.
  • 0
    Power disconnected.
    Check power supply/battery.
  • -3
    Multiple temperature sensors exceeded the defined limit.
    Run Apple Service Diagnostics to check which sensor went beyond expected thermal limits.
  • -60
    Bad master directory block (badMDBErr).
    Back up your data, erase the disk and reinstall OS X.
  • -61
    Watchdog timer detected unresponsive application, shutting down the system.
    Troubleshoot for stuck application, startup item and any loading preferences.
  • -62
    Watchdog timer detected unresponsive application, restarting the system.
    Troubleshoot for stuck application, startup item and any loading preferences.
  • -71
    SO-DIMM Memory temperature exceeds limits.
    Swap memory module and check with known-good one to confirm issue is with memory; also check fans and air flow.
  • -74
    Battery temperature exceeds limits.
    Swap battery and check with known-good one to confirm issue is with customer battery.
  • -75
    Communication issue with AC adapter.
    Check MagSafe connector/adapter plug/cable.
  • -78
    Incorrect current value coming from AC adapter.
    Check AC adapter plug/cable.
  • -79
    Incorrect current value coming from battery.
    Check battery and battery connection to logic board.
  • -86
    Proximity temperature exceeds limits.
    Check thermal contact with heatsink, fan connection/activity.
  • -95
    Temperature temperature exceeds limits.
    Check thermal contact with heatsink, fan connection/activity.
  • -100
    Power supply temperature exceeds limits.
    Check fans and air flow.
  • -103
    Battery cell under voltage detected.
    Check battery.
  • -104
    unknown
    Check battery.
  • -127
    PMU forced shutdown.
    Check power switch.
  • -128
    unknown
    May be related to RAM.