G5 booting issue

Discussion in 'PowerPC Macs' started by yawl, Feb 24, 2014.

  1. yawl macrumors newbie

    Feb 24, 2014
    I have an early G5 built in 2005 and running 10.5
    Some times I have to hit the start up several times for the unit to boot up. Often the fans go into hyper drive without start up. Other times when unit is up and running fine the unit goes into hibernation when not be used. Contemplating as reset on the PMU switch.
    Any thoughts?
  2. repentix, Feb 24, 2014
    Last edited: Feb 24, 2014

    repentix macrumors regular

    May 26, 2013
    My g5 Has the Same Problem! When this problem with The hyperventilating Fans occurs I just Power the g5 down and wiggle the ram sticks a little bit .... that does the trick ;) I think it's some kind of connector or ram problem

    Also Check your hibernation settings
  3. Intell macrumors P6


    Jan 24, 2010
    G5's cannot hibernate/safe-sleep. They can sleep, but not hibernate as laptops and G4 PowerMacs can be modified to do.
  4. eyoungren macrumors Core


    Aug 31, 2011
    ten-zero-eleven-zero-zero by zero-two
    There was an issue with the G5s oh so long ago that if you let them sleep they would not wake up and you were forced to shut them off and turn them back on. Apple "fixed" this with a firmware update, but I've since then always set the G5 I use to never sleep. I let it turn the monitor off, but not sleep.

    I know this is not entirely related to the issue here, but maybe setting the Mac to not sleep might help.

    Of course that G5 was on 24/7 (including weekends and holidays) and my boss was paying the power bill each month…
  5. AmestrisXServe macrumors 6502

    Feb 6, 2014
    This is again, likely a sensor issue.

    See my posts in this thread.

    I've had my share of these problems with G5 units.

    Flowchart for G5 Fan Speed Concerns:

    Zap PRAM;
    Check airflow door light sensor;
    Dust system with compressed air (can, or compressor);
    Reset PMU;
    Run Apple Calibration test;
    Update Firmware;
    Check HDD position; some systems default to one bay or the other;
    Check primary components (RAM, HDD/SMART Status).

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