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imac shutting down unexpectedly

34957 Views 57 Replies Latest reply: Apr 3, 2014 4:14 AM by patmos77 RSS
  • Ivan Robertovich Level 1 Level 1 (30 points)
    Currently Being Moderated
    Mar 15, 2012 4:20 PM (in response to DjShine88)

    the 2.93 Ghz sitting right in front of me has 24GB (2x4 and 2x8)

     

    the random shutdowns have nothing to do with memory.

     

    it's the SMC -- 

     

    1.  quit all apps;

    2.  zap your PRAM,

    3.  reset SMC, and

    4,  zap the PRAM again.

     

    I just ran handbrake (which taxes all eight cores), watched two youtube videos, and had photoshop working on a photo...

     

    I heard something I haven't heard in a long time -- the fans!!!   (yes your iMac has fans).

     

    If you run all that stuff, and see the activity monitor showing the cpus all maxed out...  after a minute of being pegged out, you should hear the fans and feel very hot air coming out of the upper vent on the back of the iMac

  • dannyboyo8 Calculating status...
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    Mar 15, 2012 5:11 PM (in response to Ivan Robertovich)

    I did all that, resetting Pram and SMC... more than once, but with 16 GB I still had the issue of a sudden shut down and restart...when I was on the internet.  pulled 4 gb and now have 12 and the machine runs perfect.  So to me that says my issues had something to do with the memory & my processor chip set.

     

    2.8 ghz intel core i7

  • Alien Quattro Calculating status...
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    Mar 16, 2012 1:21 PM (in response to dannyboyo8)

    Ditto. 2.8 GHZ cor i7 iMac 27-inch, Late 2009 Running 14GB RAM now. 12 worked good. 14 works good. 16 it goes apeS#@#

    dannyboyo8 wrote:

     

    I did all that, resetting Pram and SMC... more than once, but with 16 GB I still had the issue of a sudden shut down and restart...when I was on the internet.  pulled 4 gb and now have 12 and the machine runs perfect.  So to me that says my issues had something to do with the memory & my processor chip set.

     

    2.8 ghz intel core i7

  • DjShine88 Calculating status...
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    Mar 23, 2012 11:37 AM (in response to 23degreesN)

    Just FYI guys - i have taken the 16GB and 12gb ram out of my iMac...

     

    Last night in the space of 14 hours:

     

    4 Kernel Panics

    Final Cut Pro X crashed 23 times

    Photoshop crashed 3 times

    Compressor crashed 8 times

    iDVD crashed abut 8 times

    Firefox crashed about 30 times

    Echofon crashed 3 times

    DVD Player crashed twice

    iMovie crashed twice

    Chrome crashed once

    VLC crashed once

     

    And that was with 12GB of ram, not 16GB.

     

    I am returning this ram.

     

    I am running stock Ram - 4GB and it has been very very smooth.

    Programs now Lag, but they NEVER crash.

     

    With the 12 - i opened Final cut. added audio in, left it alone, went to the toilet and came back and it had crashed... without touching it - it just CRASHED.

     

    Be very careful with adding ram in guys... i'd say maybe buy Apple's Ram, don't buy the cheap one like i did...

  • ernie goldstein Level 1 Level 1 (80 points)
    Currently Being Moderated
    Mar 24, 2012 10:17 AM (in response to bressst)

    Next time your computer shuts down hit the caps lock key on your key board. If the green light goes on that means that your cimputer is not shutting down but your display is turning off.

  • DjShine88 Level 1 Level 1 (0 points)
    Currently Being Moderated
    Mar 24, 2012 10:24 AM (in response to ernie goldstein)

    Well that's a no Brainer...

  • Jonathan Mortimer Calculating status...
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    Mar 24, 2012 11:42 AM (in response to DjShine88)

    I have not had a single problem with my iMac 11,1 27" i5 running with 16GB RAM bought from Crucial, over six weeks now and counting.

  • dt3000 Calculating status...
    Currently Being Moderated
    Apr 12, 2012 3:22 PM (in response to Jonathan Mortimer)

    Regardless of how much memory I have in mine it shuts down randomly....5 times yesterday. It's been doing this since I bought it. Had a new hard drive fitted recently which had bad sectors and that was supposed to be the cause. I reinstalled everything today as advised by a repair centre and it shutdown again when I was just browsing.

     

    I'm beginning to think this machine is unfit for purpose - a £2000 piece of crap.

  • Gamara Calculating status...
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    Apr 18, 2013 12:14 PM (in response to 23degreesN)

    I had a similar problem on a 2ghz intel core 2 duo that seemed to shut down at random. I found that security was set to shut the computer down after a period of inactivity. I unchecked that option and I've had no problem since.

  • Gary Moore3 Calculating status...
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    Aug 28, 2013 12:28 AM (in response to 23degreesN)

    Had problems with the shutdowns (Mid 2010 27 2.93), and it seemed to getting worse. I replaced the 12 gig (2 x2gb and 2 x 4gb)  with 4 x 8gig from Crucial 4 months ago and haven't had a problem since. HP recalled a bunch of Samsung memory, maybe Apple should have too.

  • DaSuprano Calculating status...
    Currently Being Moderated
    Jan 22, 2014 11:25 AM (in response to 23degreesN)

    Yes, unforyunately this is an hardware issue and you will have to replace it with apple.

    The mother board for this unit is quite expensive if you dont have a warranty, its aroud $800.

     

    Sorry

     

     

     

    http://iknowios.com/

  • ECZurcher Calculating status...
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    Mar 8, 2014 5:35 AM (in response to Ivan Robertovich)

    How does one "zap" the PRAM?

  • patmos77 Calculating status...
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    Apr 3, 2014 4:14 AM (in response to ECZurcher)

    1.   

       224th February 2014 -complaints was registered( with Apple representative here) that iMac is shutting down by itself and is not restarting. Display Assembly was broken during transportation....has to pay $600 for repair

    2.       25th February 2014 – iMac was on planning and all hardware test has been done through  AST server (Apple Service Toolkit), Storage test (for Hard Disk Drive) and cooling test have been passed correctly.

    26th February 2014 –Apple centre informed that no problem has been detected on the iMac

      21st March – iMac was tested on the front desk and was delivered....

    One week after same issue with iMAC.....feel desperate

    Hardware Overview:

     

      Model Name: iMac

      Model Identifier: iMac13,2

      Processor Name: Intel Core i5

      Processor Speed: 2.9 GHz

      Number of Processors: 1

      Total Number of Cores: 4

      L2 Cache (per Core): 256 KB

      L3 Cache: 6 MB

      Memory: 8 GB

      Boot ROM Version: IM131.010A.B05

      SMC Version (system): 2.11f14

     

     

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