1 2 3 4 Previous Next 57 Replies Latest reply: Apr 3, 2014 4:14 AM by patmos77
23degreesN Level 1 Level 1 (0 points)
iMac shuts down at random and seems to be attributed to invalid volume file count. I managed to successfully repair the disk and permissions through 'Utilities' on the Installation CD but problem reoccurs - after each unexpected shutdown Disk Utility reports another invalid volume file count.

Typing 'shutdown cause' in the all messages filter of Console reports no result - its like it never happened!

So far it has shutdown 10/12 times today, although the last shutdown was the longest interval yet: an hour or so.

iStats show CPU temperatures as fairly normal:

CPU 52
CPU Heatsink 46
Ambient 26
Mem 49
CPU Diode 60

any thoughts?

iMac, Mac OS X (10.5.8)
  • 1. Re: imac shutting down unexpectedly
    den.thed Level 7 Level 7 (23,900 points)
    Hi 23dedreesN

    Welcome to Apple Support Communities

    Check for loose electrical connections and reset or replace that surge protector if it's old.

    Run the Apple Hardware Test > http://support.apple.com/kb/HT1509

    Dennis
  • 2. Re: imac shutting down unexpectedly
    23degreesN Level 1 Level 1 (0 points)
    Dennis,

    Thanks I will try that. In the mean time I ran Diskwarrior which gave me the following report:


    DiskWarrior scanned the disk named "iMac 596GB" checking all files and folders for damage and potential
    compatibility problems.
    Permissions:
    Started verify/repair permissions on disk disk0s2 iMac 596GB
    Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/CodeResources", should be -rw-r--r-- ,
    they are lrw-r--r--
    Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/DVD.frappliance/Contents/
    CodeResources", should be -rw-r--r-- , they are lrw-r--r--
    Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/FRSettings.frappliance/
    Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r--
    Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/FRSources.frappliance/
    Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r--
    Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/Movies.frappliance/Contents/
    CodeResources", should be -rw-r--r-- , they are lrw-r--r--
    Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/Music.frappliance/Contents/
    CodeResources", should be -rw-r--r-- , they are lrw-r--r--
    Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/Photos.frappliance/Contents/
    CodeResources", should be -rw-r--r-- , they are lrw-r--r--
    Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/Podcasts.frappliance/
    Contents/CodeResources", should be -rw-r--r-- , they are lrw-r--r--
    Permissions differ on "System/Library/CoreServices/Front Row.app/Contents/PlugIns/TV.frappliance/Contents/
    CodeResources", should be -rw-r--r-- , they are lrw-r--r--
    Permissions differ on "System/Library/PrivateFrameworks/BackRow.framework/Versions/A/CodeResources", should
    be -rw-r--r-- , they are lrw-r--r--
    Permissions differ on "Library/Internet Plug-Ins/JavaPluginCocoa.bundle/Contents/CodeResources", should be -rwrw-
    r-- , they are lrw-rw-r--
    Warning: SUID file "System/Library/PrivateFrameworks/DiskManagement.framework/Versions/A/Resources /
    DiskManagementTool" has been modified and will not be repaired
    Warning: SUID file "usr/sbin/pppd" has been modified and will not be repaired
    Warning: SUID file "usr/sbin/vpnd" has been modified and will not be repaired
    ACL found but not expected on "Applications/Utilities"
    Finished verify/repair permissions on disk disk0s2 iMac 596GB

    Disk: "iMac 596GB"
    The Property List data was checked in 7,988 files.
    The Resource Data was checked in 6,689 files.
    The maximum Folder Depth on this disk is 21. This does not exceed the maximum recommended depth.
    The System Symbolic Link Files were checked and no problems were found.
    Location: "Desktop"

    File: "._Info.plist"
    Detected that Property List data is damaged and cannot be repaired.
    XML parser error:
    Unexpected character
    at line 1
    Old-style plist parser error:
    Unexpected character '0x5' at line 1
    Location: "iMac 596GB/System/Library/Modem Scripts/HUAWEI Mobile.ccl/Contents/"

    File: "._version.plist"
    Detected that Property List data is damaged and cannot be repaired.
    XML parser error:
    Unexpected character
    at line 1
    Old-style plist parser error:
    Unexpected character '0x5' at line 1
    Location: "iMac 596GB/System/Library/Modem Scripts/HUAWEI Mobile.ccl/Contents/"

    File: "com.apple.iphotomosaic.plist"
    Detected that Property List data is damaged and cannot be repaired.
    Conversion of data failed. The file is not UTF-8, or in the encoding specified in XML header if XML.
    Location: "iMac 596GB/Users/imac24/Library/Preferences/"
  • 3. Re: imac shutting down unexpectedly
    23degreesN Level 1 Level 1 (0 points)
    Connections all seem good.

    I ran the AHT - no problems found.
  • 4. Re: imac shutting down unexpectedly
    den.thed Level 7 Level 7 (23,900 points)
    When you say "shutting down unexpectedly" do you mean that everything just going black or that you are having Kernel Panic's? > http://support.apple.com/kb/HT1392

    If Kernel Panic, see > http://www.thexlab.com/faqs/kernelpanics.html

    Also note: that in 10.5 Leopard the Disk Utility's Repair Disk Permissions messages that you are getting can be safely ignored. > http://support.apple.com/kb/TS1448
  • 5. Re: imac shutting down unexpectedly
    23degreesN Level 1 Level 1 (0 points)
    Everything goes black, computer switches off instantly and I have to manually push the power switch in the back of the imac to boot up the machine again
  • 6. Re: imac shutting down unexpectedly
    den.thed Level 7 Level 7 (23,900 points)
    Could be a loose/improperly seated or bad RAM module.

    Reinstall the RAM, pushing firmly on each module with both thumbs to ensure they are fully seated.
    Reinstall your factory RAM if you have upgraded with third party RAM.
    If you have 2 modules, install one module a time and test.

    See > http://support.apple.com/kb/ht1423

    It could also be an overheating problem with any number of components, that is causing the iMac to shut down abruptly. If the Extended Apple Hardware Test does not catch the problem, then you will need to take it to an Authorized Service Provider for testing.
  • 7. Re: imac shutting down unexpectedly
    elmac Level 5 Level 5 (4,230 points)
    Hi, are you using a Surge Protector?
    Have you tried the Mac on a different power circuit?
    Try a different power cord!
    Have you downloaded any New Apps just prior to this Issue?...L
  • 8. Re: imac shutting down unexpectedly
    23degreesN Level 1 Level 1 (0 points)
    Yes I am using a surge protector. I have a diskstation server and modem also connected to the same surge protector with apparently no problem - I think it is stable

    I reinstalled RAM but it seemed pretty well seated

    Can anyone translate the report I posted earlier? Is there anything to be concerned about regarding the file count or damaged property lists?
  • 9. Re: imac shutting down unexpectedly
    .frustration. Level 1 Level 1 (0 points)
    Hi,

    I am experiencing almost exactly the same problem as 23degreesN. When the computer is idle it will remain powered on but when applications are running (and it doesn't seem to be attributed to a particular application) it will randomly shut down with black screen and has to be manually restarted (although like some other posts it will always start straight away without problem)

    In my energy saver settings I have 'Restart automatically after a power failure' unchecked which is probably why it doesn't automatically restart.

    To try and resolve the problem I have done all that 23degreesN has done, I have also done a few things in addition:

    I have used Diskwarrior (which was run from an external bootable hard-drive) to try and repair the computer. It completed the repairs successfully but the problem still remains.

    I swapped the power cable from another iMac hoping that it might have been something as simple as a faulty cable. problem still remains.

    Anyone out there with any ideas?
  • 10. Re: imac shutting down unexpectedly
    .frustration. Level 1 Level 1 (0 points)
    continuing from my post above....

    I have tried taking out the RAM, putting one back in, restarting - computer shuts down after 5 mins
    and then replacing it with the other stick assuming that one may be faulty - again computer shuts down. Conclusion: I dont think the RAM is the problem unless both sticks are faulty

    The only thing I can think of now is that the power pack in the computer is faulty but I am doubtful that this is the cause because if the computer remains idle (no applications running) it doesn't shutdown.
  • 11. Re: imac shutting down unexpectedly
    bressst Level 1 Level 1 (0 points)
    Ok let me give you my thoughts after all the shutdowns I had on 2 iMacs 27:
    I got my iMac 27 2.93 early september 2010. I made the upgrade to 16Gb (not have anytime to test the original 2x2 GB). I got many shutdowns. I call the support and made on my own all the following tests before calling them :
    1 - Run the Techtool deluxe from Apple : everything was ok
    2 - Reset the RAM : problem still there
    3 - Reset SMC : problem still there
    4 - Reinstall the OS from scratch on the internal 2nd drive (HDD instead of the SDD) : problem still there
    5 - Deconnect all peripherals connected to the iMac : problem still there

    It took 5 minutes to the Apple support to understand it was probably a hardware issue with the motherboard or an electrical issue. As it was less than 15 days I bought the mac, they send me a new one and got the old one after I received the new one (good service).

    UNFORTUNATELY SAME ISSUES with the new one !!!!
    Redo the same tests and same problems.
    So I'm not sure about the interest for me to get a third delivery...
    Reading all the threads, I conclude this is either a real hardware issue or a RAM issue because of the 16GB.
    I just decreased the RAM to 12 GB yesterday and I will see....I'm pretty sure the problem will not occur. If confirmed I think we have no other choice to wait for an update unless the problem is a real hardware issue. I bought the apple care program so I can see within the next 3 years.
    This is crazy not being able to use the 16 GB.
    Feel free to give your thoughts.
    Thanks
  • 12. Re: imac shutting down unexpectedly
    bressst Level 1 Level 1 (0 points)
    So far no shutdown after 4 days....
  • 13. Re: imac shutting down unexpectedly
    emilvals Level 1 Level 1 (0 points)
    Hello, I bought a new 27" iMac i7 last week. First problem I encountered and I am still encountering is random packetloss, I'm using a wired connection.

    I also bought 16GB Ram from Macsales.com this week and installed it in the machine and this morning my iMac just completely shutdown like you are experiencing. Hardware diagnostics don't find any problems.
  • 14. Re: imac shutting down unexpectedly
    bressst Level 1 Level 1 (0 points)
    Hello,
    This has been now 8 days with 12 gb instead of 16 gb, still no shutdown (for information my iMac is on 24 by 7).
    So it seems that the 16gb is causing the problem....and we all have different brands of RAM.
    I'm not sure if someone bought the 16gb directly from Apple to see if they have the problem or not.
    If YES, I would say there is a serious problem on the Apple side
    if NO, then they are using very specific RAM (not standard) and this is not acceptable
1 2 3 4 Previous Next