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G5 1.8 SP - Shut Downs - No Warning

391 Views 12 Replies Latest reply: Nov 20, 2012 3:06 AM by japamac RSS
ENIGMACODE Level 1 Level 1 (75 points)
Currently Being Moderated
Nov 18, 2012 3:59 PM

Hi Gang

 

Working on a SP 1.8 for a freind. 7 Good GB's RAM, plenty of system drive space. It was mine for a while, never had a problem before. Seems after I inserted a different system drive with 10.4.11,the system started to experience strange 'shut downs.' Just a cold hard shut down. Not like a tyical warning screen that cascades before you, showing/illustrating numerous codes, and numbers with the warning/prompt, that you have to manually shut the system down by holding in the power button. This is simply a 'complete shut down.' I've since replaced the PRAM battery, peformed a CUDA, and also a VPRAM/NRAM, (3 distinct chimes). Now I'm watching, waiting, running software, looking for any warning signs. I'm also watching, using Activity Monitor, watching very closely. So far, nothing of concern.

 

Any ideas?

 

Thanx

Mike 

  • BDAqua Level 10 Level 10 (114,800 points)
    Currently Being Moderated
    Nov 18, 2012 6:23 PM (in response to ENIGMACODE)

    Get Temperature Monitor to see if it's heat related...

     

    http://www.macupdate.com/info.php/id/12381/temperature-monitor

     

    iStat Menus...

     

    http://bjango.com/mac/istatmenus/

     

    And/or iStat Pro...

     

    http://www.islayer.com/apps/istatpro/

     

    If you have any temps in the 70°C/160°F range, that's likely it.

  • BDAqua Level 10 Level 10 (114,800 points)
    Currently Being Moderated
    Nov 18, 2012 7:54 PM (in response to ENIGMACODE)

    Easily could be that drive...

     

    http://thecoredump.org/2004/02/more-on-applepmupmu-forced-shutdown/

     

    Also, is it connected to a UPS? Did you try a Safe Boot?

  • BDAqua Level 10 Level 10 (114,800 points)
    Currently Being Moderated
    Nov 18, 2012 11:29 PM (in response to ENIGMACODE)

    By UPS, I mean is the whole computer plugged into a Uninterruptible Power Supply?

     

    http://en.wikipedia.org/wiki/Uninterruptible_power_supply

  • japamac Level 7 Level 7 (24,390 points)
    Currently Being Moderated
    Nov 19, 2012 4:20 AM (in response to ENIGMACODE)

    The PMU forced shutdown error message log tells you that it is likely a hardware issue, as opposed to software, that is causing the forced shutdown.

     

    BDAquas mention of the UPS is of importance, as dirty power can also cause a PMU forced shutdown. A UPS cleans up and backs up the power for the machine.

     

    I would remove the old hard drive simply to rule it out as a source of trouble.

     

    The PSU could also be overheating due to dust accumulation. The G5 PSU is good at sucking in dust, but terrible at allowing the dust to leave or be removed.

    Overheat due to dust could cause faltering of power supplied, thus resulting in the PMU forced shutdown.

     

    Compressed air is one way people get the dust out. Disassembly is the most sure way.

     

    Oh, and don't rule out failing PSU fans.....

  • japamac Level 7 Level 7 (24,390 points)
    Currently Being Moderated
    Nov 19, 2012 1:45 PM (in response to ENIGMACODE)

    The PSU has no sensors, temperature or RPM. Only visual, physical confirmation of function can confirm the fans are working.

    As for dust, the PSU is unlike the fins on the heatsink. It is an enclosed box, where air moves over the PSU components and heatsink from one end to the other, with dust accumulation points all along the entire length of the PSU being had around board components and the internal heatsink.

     

    The PSU is very hard to clean and contains no monitoring capability.

  • japamac Level 7 Level 7 (24,390 points)
    Currently Being Moderated
    Nov 20, 2012 3:06 AM (in response to ENIGMACODE)

    Temps all look good.

    Getting rid of the drive may have been the necessary step.

    It's not really surprising, if it turns out to have been the drive, as flaky drives can cause all sorts of evil.

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