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Q: PowerMac G5 frequent Kernel Panics

My Mac is a late-2005 model G5 Dual 2 GHz.  Several months ago I upgraded from Tiger 10.4.11 to Leopard 10.5.8.  Couple months later I started getting frequent Kernel Panics:  Usually after running some maintenance software and a restart, but also after regular restarts (otherwise I leave my Mac on all the time), when couple hours later, always at night, I find the Mac shut down while the fans are loudly blowing at full speed.

 

I've alreday been running DiscWarrior periodically, as well as Cocktail. I also ran some hardware tests (DiscUtility, Drive genius, TechTool Pro) which found nothing abnormal with any of my hardware.

 

Based on what I've read, I checked my Console report, looking for  "shutdown cause" and here's what I found next to each crash:  (date, time) localhost kernel[0]: AppleSMU -- shutdown cause = 2  and I'm wondering what is the "2" meaning (the article I read was showing "3" as an example, though not explaining its meaning).

 

I'm already planning to open my Mac this weekend, reset the SMU (I understand my Mac has an SMU, not PMU), but before doing that, I'd like to know if anybody has an idea what is that cause = 2 meaning....

 

Thanks so much....

Power Mac G5 (Late 2005), Mac OS X (10.5.8), 5 GB Ram

Posted on Oct 10, 2012 9:19 AM

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Q: PowerMac G5 frequent Kernel Panics

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  • by japamac,Solvedanswer

    japamac japamac Oct 17, 2012 2:21 PM in response to mynameismyname
    Level 7 (24,390 points)
    Oct 17, 2012 2:21 PM in response to mynameismyname

    1- Misreports are common, though not as with OWC RAM. Check with them.

    2- Switch the RAM. Put the 512 MB DIMMs in the innermost slots.

  • by mynameismyname,

    mynameismyname mynameismyname Oct 17, 2012 2:46 PM in response to japamac
    Level 1 (18 points)
    Mac OS X
    Oct 17, 2012 2:46 PM in response to japamac

    1- Misreports are common

    So you're saying there should not be that difference under the "speed" column? Should I call OWC ?

  • by japamac,

    japamac japamac Oct 17, 2012 2:56 PM in response to mynameismyname
    Level 7 (24,390 points)
    Oct 17, 2012 2:56 PM in response to mynameismyname

    Check with them.

    Check with them.

  • by mynameismyname,

    mynameismyname mynameismyname Oct 20, 2012 11:07 AM in response to japamac
    Level 1 (18 points)
    Mac OS X
    Oct 20, 2012 11:07 AM in response to japamac

    Here's an update:

     

    Thursday evening, while my Mac shut down I pulled out the power cable, I pulled out all my DIMMS, and I reset the SMU button. 

     

    I put back my DIMMS, BUT THIS TIME, UNLIKE BEFORE, THE BASIC, 512 DIMMS I PLACED IN THE INNER SLOTS, AND THE NEWER, 2GB DIMMS IN THE OUTER SLOTS.

     

    The computer has been functioning OK.  NO CRASHES AT NIGHT.... Yesterday I ran Memtest (covered under a separate thread), and even though I didn't run it at Single-Mode, there were no errors.

     

    So I really don't know WHAT "fixed" the computer (at least so it SEEMS so far), if it was the SMU reset, or swapping the DIMMS placement....  All I can say, is my Mac is behaving SO FAR nromally.  I think I will still order the 4200 DIMMS from OWC, replace the 3200 with them.

     

    Thsnkd, for all the help, Japamac!

  • by mynameismyname,

    mynameismyname mynameismyname Oct 24, 2012 4:55 PM in response to mynameismyname
    Level 1 (18 points)
    Mac OS X
    Oct 24, 2012 4:55 PM in response to mynameismyname

    UPDATE:

     

    The 2GB DIMMS were 5300 speed, even though my Mac regostered them as 3200.  Crucial (turns out those DIMMS were actually purcahsed from them, not OWC) were nice enough to send me new 5300 DIMMS, but again, my Mac rates them at 3200.  Either way, the computer is back to normal, which is good news....

  • by BDAqua,

    BDAqua BDAqua Oct 24, 2012 9:24 PM in response to mynameismyname
    Level 10 (123,780 points)
    Oct 24, 2012 9:24 PM in response to mynameismyname

    Great to hear!

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