Previous 1 2 3 4 5 Next 136 Replies Latest reply: Jan 22, 2014 1:14 PM by berrisj1 Go to original post
  • Rojer W. W. Level 1 (45 points)
    I am interested in your final results (@peterwillem and ~bee). I started out on the thread that Berry with an "A" (for attitude, maybe?) had started, not realizing that their was such a finite discrimination from machine to machine, as far as the threads go anyway. My issue so far has only been the sudden shutdowns. Occasionally accompanied by a faint "TICK" or "pop" sound, but not always. Likewise, sometimes there was heat behind the upper left corner, not always. Sometimes, with Safari and/or Flock open, and/or Aperture3.

    I also have the kernel Previous shutdown cause: -128 error.

    I also have the OWC branded 16GB upgraded from the original Apple RAM.
    Mac OS X version 10.6.4 - Build 10F2061
    Model Name: iMac
    Model Identifier: iMac11,3
    Processor Name: Intel Core i7
    Processor Speed: 2.93 GHz
    Number Of Processors: 1
    Total Number Of Cores: 4
    L2 Cache (per core): 256 KB
    L3 Cache: 8 MB
    Memory: 16 GB - 1333 MHz - DDR3
    Processor Interconnect Speed: 4.8 GT/s
    Boot ROM Version: IM112.0057.B00
    SMC Version (system): 1.59f2
    Intel 5 Series Chipset:
    Vendor: Intel
    Product: 5 Series Chipset
    Link Speed: 3 Gigabit
    Negotiated Link Speed: 3 Gigabit
    Description: AHCI Version 1.30 Supported

    Hitachi HDS722020ALA330:
    Capacity: 2 TB (2,000,398,934,016 bytes)
    Model: Hitachi HDS722020ALA330

    Intel 5 Series Chipset:
    Vendor: Intel
    Product: 5 Series Chipset
    Link Speed: 3 Gigabit
    Negotiated Link Speed: 1.5 Gigabit
    Description: AHCI Version 1.30 Supported

    Model: HL-DT-STDVDRW GA32N
    Revision: KC12

    Login Items:
    VMware Fusion Helper
    Drobo Dashboard
    IntegoStatusItemHelper (All Users)

    The SMC reset, which I call the cold, hard boot or say that I am depleting the capacitors, did not work for my situation (and now I understand why).

    I very much would like to avoid rebuilding my computer from scratch and it would be inconvenient (but do-able) to work through the whole RAM swapping thing.

    I hope that we all get this answered correctly for each of our explicit machines.

    Message was edited by: Rojer W. W.

    Message was edited by: Rojer W. W.
  • peterwillem Level 1 (10 points)
    Hi Roger,
    I will very soon write a summary of my findings in a new thread, will save readers from struggling thru this one.
    The faint tick or popup ,you mentioned, I did not notice.
    About the 128 error I found out that it only occurred ( with me) when, after finding the computer black and silent, I restarted it by pressing the power button.The log showed the 128 error at exact the same time as I pressed the button. That gave me the idea that the computer did not actually shutdown but went into a sudden sleep mode, from which it only could be wakened by pressing the power button.
    I know the difference is marginal between sudden shutdown and that kind of sleeping mode, but there must be some difference I guess.
    Look out for my new thread on this issue.

  • peterwillem Level 1 (10 points)
    I have finished the testing of the 2nd set of 2 x 4 G OWC ram and again no problems. After putting back all the 4 x 4 G OWC ram I had a sudden shutdown again within 6 or 7 hours.
    I tried working the OSX SL in the 64 bit mode, but than again after 4 o5 hours the same problem.
    Now I am working with 2 x 4 G OWC ram and 2 x 2G Apple ram. So far no problems, but it is early days yet.
    I just mailed the whole story to OWC and am waiting for their reply.

    peter willem
  • peterwillem Level 1 (10 points)
    I like to quote OWC reaction to my mail:


    +OWC has tested the ram in multiple iMacs of this group and the machines work fine with 16 gb of ram.+

    +Technical Customer Service Representative+
    +Other World Computing, Inc. (OWC)+, Inc.+

    So how come that so many of us have problems with that same ram? What is going on?
    Hope that somebody fromApple or OWC van shed some light on this.
    I obviously X'ed the name of the person in the mail.
    peter willem
  • JDI Level 1 (0 points)
    I have the same problem using Crucial ram.
  • Level 1 (0 points)
    Hey everyone. I am experiencing the same problem. I have owned this iMac for about 3 weeks and just experienced my first random shutdown.

    My Specs:
    16GB 1333MHZ DDR3 SDRAM-4X4GB

    Does anyone know what is causing this!?
  • Level 1 (0 points)
    Here is a link to what the console said. I have no idea what this means, but I saw other people posting this.
  • peterwillem Level 1 (10 points)
    What brand of ram are you using? Apple, OWC, Crucial or some other?

    peter willem
  • Level 1 (0 points)
    I am using the ram straight from Apple. They built the entire computer shown in my above post. The Random Shutdown happened 3 more times in the span of 3 hours last night and I just kept it off. Help!
  • peterwillem Level 1 (10 points)
    If this iMac is new from Apple than you still have about a year guarantee and you should contact Apple Care asap.
    Meanwhile, if you need your computer and it is not working than take 2 pcs of ram out of the lower slots (the ones closest to the screen. Read the instructions in the manual.
    The problem lies most likely with the 16 G ram, and 8G should work without problems.
    But you paid for 16G so back to Apple for this.

    peter willem
  • __Tom__ Level 1 (0 points)

    same situation here: Starting with 16 GB RAM I had some sudden shutdowns every day under several conditions.
    Following your idea to reduce the RAM to 12 GB did the trick for me. Since then no shutdowns in the last three days.
    I conclude, that the iMac 11,3 can't handle with 16 GB RAM.

    Thanks so much for this thread!

  • Edmond Leung Level 2 (155 points)
    I am having the same problem and lately seems like I am able to reproduce the shut down but not all the time. I use Aperture 3.0.3, the computer have been shutting down by itself more than 8 times in the last nights while I am syncing photos with Facebook.
  • __Tom__ Level 1 (0 points)
    Well, in the first days I had the same impression: It seemed to me that Aperture (3.0.3) was the trigger of sudden shutdowns. Heavy computation after migrating my image database to the iMac were interrupted a lot.
    Then, the same happened with iTunes after migration of the data. In both cases big parts of the data are on a QNAP NAS, so I suspected that combination not to be fitting.
    In the end it turned out for me that sudden shutdowns also occurred using several other software (Mail, Safari, even Finder some times). The conditions varied from high cpu load to nearly idling, from over 60 degrees Celsius (that's 140 F) down to 28 C (82 F), with a lot of apps running at the same time as well as only one app open.

    So, I am not able describe any condition to be typical for sudden shutdowns.

    After biting the bullet and reducing the RAM to 12 GB one week ago I didn't experience any shutdowns at all. Though I hate to not being able to use full 16 GB of RAM, it seems to me the best deal between effort and benefit.
  • peterwillem Level 1 (10 points)
    what brand of ram do you use? (OWC, Crucial,....)
    You are using 12 G now,you can upgrade that to 14 G. Read the other threads about this problem.

  • __Tom__ Level 1 (0 points)

    I use OCZ (OCZ3MV13338GK) 4 GB in combination with the original 2x2 GB (Hynix) in my machine.
    Thank you for your assistance.

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