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  1. #41

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    That kernel panic is talking about the northbridge (UniNorth) and the AGP card - I'd remove your video card and put it back in.
    The discussion has continued at AppleTalk Australia.

  2. #42

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    Indeed, from a quick glance that looks like video ram is the culprit.
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  3. #43

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    Kernel panics are almost always indicate a hardware fault.

    If your machine is still under warranty, definitely send it back.

  4. #44

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    Thanks for comments, guys. No, sadly, it's not under warranty. In which case, is my technician indeed right that it wouldn't be economic to get it fixed?Currawong - you say pull the video card. Apart from the fact that I'm nowhere near techie enough to try that without fainting, I though the video card was soldered to the logic board on these imacs anyway? Is that right?
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  5. #45

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    I got one a couple of days ago on an iMac G5. I&#39;ve had it for a few months without any problems (no burning smell so I may have got lucky on the capacitors - hopefully that&#39;s not jinxing it&#33. I think it *may* have had to do with accessing a remote FTP server in the Finder but I can&#39;t tell because there was no entry in the panic.log file at all. Admittedly it had been running for over three weeks and I&#39;d had to forcibly kill a few apps in recent days but I&#39;d expect to at least be given a hint as to the cause.
    Pass the crystal, spread the Tarot, in illusion comfort lies

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  6. #46

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    i had the same problem on my imac g5 after i deleted some system files my mistake.

    1. remove the battery and powercord for 30seconds, place them back in, powerup... done

    2. IF you still come up to that screen, do it again but insert your apple installation CD and boot from the CD (press C), you need to press it in time, if you don&#39;t, leave the CD inside and redue step 1.

    3. the installation window will come up, go to Disk Utility and repair permissions. this should fix everything.

    I don&#39;t believe this is a hardware issue. One of your system files is probably missing or corrupted, like the kernel or something.

  7. #47

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    Cheers, d_h, but I&#39;m pretty sure I didn&#39;t delete any system files. After the crash I simply hit the power button and it came back on and has run OK so far. Given the number of apps that were starting to get the spinning beachball of death there was probably some corruption that had been building in the OS for a few days. It was either a subtle bug or it got hit by a cosmic ray.
    Pass the crystal, spread the Tarot, in illusion comfort lies

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  8. #48

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    Ordinarily, I wouldn&#39;t consider this much of a problem - once in a while is acceptable. However, this has occurred at least 3 times in the last month - prior to that, there was no issue.

    My iMac G5 forces a shutdown. This is where the whole screen turns a transparent grey, with a big powerbutton image in the centre and text along the lines of &#39;your computer has crashed. hold down the power button until the blimmin&#39; thing switches off, then power back up&#39;.

    I don&#39;t know what is causing these shutdowns. When it happens, the fans spin like crazy and you can hear them from the other end of the house (and we have a big house&#33.

    It happened again this morning, and my last action was simply to manually put the iMac to sleep. The only app I had running at the time was Mail and Launchbar.

    Anyone else experiencing something similar and/or know why this occurring?
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  9. #49

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    Originally posted by mwot@Dec 29 2005, 09:13 AM
    My iMac G5 forces a shutdown. This is where the whole screen turns a transparent grey, with a big powerbutton image in the centre and text along the lines of &#39;your computer has crashed. hold down the power button until the blimmin&#39; thing switches off, then power back up&#39;.
    Kernal Panic. Basically something in your hardware is not working as it should, maybe RAM, maybe hard drive, maybe logic board. Check your logs and see if anything is said in there&#33;

    EDIT: Should tell you how to check logs just in case. Go to apple menu, go down to "about this mac" and head over to system profiler. Logs are in there

  10. #50

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    What OS r u running?
    I had the same problem on my emac but mine was constant and happened when i opened 2 or more programs.
    I found out it was some conflict with the operating system and a program.
    I did a clean install and all is well again & I&#39;m writing this off my 1.25Ghz eMac with OS X 10.3.9 and no issues.
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  11. #51

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    Kernel panics usually have a definite cause. Can you think of something new you installed about a month ago? Extra RAM maybe? A new piece of software? Chances are, there is something new you&#39;ve added to your iMac recently that is leading to this conflict.

  12. #52

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    Originally posted by hawker@Dec 29 2005, 10:48 AM
    EDIT: Should tell you how to check logs just in case. Go to apple menu, go down to "about this mac" and head over to system profiler. Logs are in there

    Your pre-empting this question is much appreciated&#33;

    applecollector - I&#39;m running 10.4.x. I&#39;m hoping it won&#39;t come down to a restore.

    Regardless, I&#39;ll have to wait until I get back home from work tonight to check.

    Thanx.
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  13. #53

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    Merged topics, since I set up this sticky on kernel panics a while back.
    The discussion has continued at AppleTalk Australia.

  14. #54

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    What rev iMac?

    Isn&#39;t this a known issue with the last gen of iMac G5s?
    (A power supply issue that caused them to shut down unexpectedly)

  15. #55

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    Originally posted by marc@Dec 29 2005, 12:28 PM
    What rev iMac?

    Isn&#39;t this a known issue with the last gen of iMac G5s?
    (A power supply issue that caused them to shut down unexpectedly)
    Mine&#39;s a rev B - 20" 2.0ghz.

    I have added after-market RAM, but if that is the problem, I would have expected it to be an issue months ago as I installed the additional RAM only a week after getting the machine in May.
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  16. #56

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    Okay. I&#39;ve found my system logs. So ... what is it that should tell me what the problem is ...?

    EDIT: assuming I should be looking at the panic.log?? All gibberish to me.
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  17. #57
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    Uh, I&#39;m not a kernel developer or anything, but I code in c for other platforms and this is interesting to me:


    Kernel loadable modules in backtrace (with dependencies):
    com.apple.GeForce(3.4.2)@0x92f000
    dependency: com.apple.iokit.IOPCIFamily(1.4)@0x450000
    dependency: com.apple.iokit.IOGraphicsFamily(1.3.4)@0x463000
    dependency: com.apple.NVDAResman(3.4.2)@0x498000
    dependency: com.apple.iokit.IONDRVSupport(1.3.4)@0x482000
    com.apple.NVDAResman(3.4.2)@0x498000
    dependency: com.apple.iokit.IOPCIFamily(1.4)@0x450000
    dependency: com.apple.iokit.IOGraphicsFamily(1.3.4)@0x463000
    dependency: com.apple.iokit.IONDRVSupport(1.3.4)@0x482000
    Basically, programming anything - including a OS kernel - is all about making calls to a function ... which then calls another function ... and then that calls another function ... and so on.

    A backtrace tells you which function the program died in, and what path was taken to get to that function.

    The repeated references to graphics related drivers/hardware would indicate to me that rather being an issue with system RAM, its more likely to be an issue with the RAM included with the NVidia GPU, or the NVidia GPU itself.

    As these components are soldered onto a machine&#39;s logic board (with the exception of the workstation class machines which use a PCI card), I would expect that if you send it to Apple for repair, they will determine that they need to replace the system logic board.
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  18. #58

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    Hmmm. Okay. Though, does this mean anything to anyone?

    Backtrace:
    0x002C720C 0x002C4894 0x005486EC 0x0003C744 0x000A9814
    Kernel loadable modules in backtrace (with dependencies):
    com.apple.iokit.IOSCSIArchitectureModelFamily(1.4. 4)@0x53b000
    Proceeding back via exception chain:
    Exception state (sv=0x3A163A00)
    previously dumped as "Latest" state. skipping...
    Exception state (sv=0x3AF62A00)
    PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)

    Kernel version:
    Darwin Kernel Version 8.3.0: Mon Oct 3 20:04:04 PDT 2005; root:xnu-792.6.22.obj~2/RELEASE_PPC
    panic(cpu 0 caller 0xFFFF0004): 0x400 - Inst access
    Latest stack backtrace for cpu 0:
    Backtrace:
    0x00095698 0x00095BB0 0x0002683C 0x000A8304 0x000ABC80
    Proceeding back via exception chain:
    Exception state (sv=0x3A163A00)
    PC=0x00000000; MSR=0x40009030; DAR=0x010D8410; DSISR=0x40000000; LR=0x002C7270; R1=0x2205BD20; XCP=0x00000010 (0x400 - Inst access)
    Backtrace:
    0x002C720C 0x002C4894 0x005486EC 0x0003C744 0x000A9814
    Kernel loadable modules in backtrace (with dependencies):
    com.apple.iokit.IOSCSIArchitectureModelFamily(1.4. 4)@0x53b000
    Exception state (sv=0x3AF62A00)
    PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)

    This happened a little earlier this evening. All I did was try to put the iMac to sleep. In fact, of the times that this has happened, it seems to be (intermittently) when the iMac either attempts to or is put to sleep.

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  19. #59

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    mwot I am pretty sure that it is a kernel error. It happened to my brothers iMac G3 every time he slept it with classic still open
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  20. #60
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    Originally posted by mwot@Jan 7 2006, 10:32 PM
    This happened a little earlier this evening. All I did was try to put the iMac to sleep. In fact, of the times that this has happened, it seems to be (intermittently) when the iMac either attempts to or is put to sleep.
    com.apple.iokit.IOSCSIArchitectureModelFamily(1.4. 4)@0x53b000

    Something to do with disk access. May not indicate a hardware error - could just be a bug in the OS.

    However. Do you have any third party drivers installed for anything at all, like a memory card reader or something like that?
    In ur forums, upgradin'.

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