Previous 1 2 3 4 Next 509 Replies Latest reply: Nov 22, 2015 4:06 AM by paul_ngc Go to original post Branched to a new discussion.
  • Berry with an "A" Level 1 (0 points)
    If anyone's interested...

    Since doing a SMC reset (shortly after my last BLACK OUT on 6/27/2010) I've not had my i7 27" go down on me. I've not worked it very hard, but the last time it blacked out - I wasn't working it hard then.

    I've spoken with two upper tier tech support, the second was after Apple called me back today to follow up with the issue. So I don't know if that kind of call back is normal, or if Apple is checking up because they know there is some kind of issue of i7's just shutting down.

    I was told from the upper tech support rep that: the report I was able to save after it restarted indicated the processor was trying to read a (generic) cache file and caused such a massive kernel attack, that to protect itself, the iMac shut itself down.

    So, in short, I don't think Apple still knows what issue there is, what's causing it, nor how to resolve it. Hopefully though the SMC reset fixed my issue. Only time will tell, and thank goodness I have extended AppleCare!

    Happy Mac'n
  • ZigZagLens Level 1 (0 points)
    I received a similar call a couple weeks ago. Also, after holding out for a couple months since my "repair" - resisting the SMC firmware update - I applied it today. We'll see how things go.
  • burkanov Level 1 (5 points)
    I have the same problems: my brand new 27" iMac just shuts down 2-3 times in an hour. It has 16GB RAM and both 256GB SSD & 1TB HDD. Must bring it back to Apple and wait another 3 weeks until they fix it...
  • Paradoxx Level 1 (20 points)
    Hi Burkanov,

    Are you using 3rd party RAM? It sounds like it could be a problem with 'bad' memory.
  • Level 1 (0 points)
    I am having the same problem. And so are one of my friends. I have tried resetting my SMC now, and I'll see if it gets better. My machine has turned its self off 9 times since i bought it. (4 months ago)
  • Berry with an "A" Level 1 (0 points)
    Hi everyone. I'm the one who started this thread. There had been a SMC firmware update few months back with Apple's software update. I personally believe, although Apple won't say, that firmware update caused my random shut downs. However, when I reset the SMC - that seemingly simple act - so far, has solved the problem.

    Rarely do you see anyone from Apple officially comment within the forums, but I have had the top tier tech support actually talk with me on the phone. They actually called me back on it once, and after I told them what I had done, with the results I had, they seemed the issue was probably resolved.

    The short of it is, a few weeks after I updated the firmware, my iMac just randomly shut down out of the blue - twice within a week. I thought it might be heat related because like others, my top left corner gets extremely hot.

    After I reset the SMC my iMac doesn't seem to run as hot as it did, or at least to the point where I could actually hear the fans. But more importantly - my iMac has not shut down once on me since I reset the SMC. Because of this, and not having any further issues since, I'm going to mark this issue/question as answered.
  • Berry with an "A" Level 1 (0 points)
    As I mentioned in my very last post. I've not had any issues with my configured iMac since simply resetting the SMC. Not one random shut down since then.
  • Loudwater Level 1 (0 points)
    Thanks so much for this detailed thread, Berry with an "A"!!! My work computer, exactly the same model as yours, had the same random shutdown problem for a couple of weeks. I went through the thread, and reset my SMC. It's been 2 days since, and I have NOT encountered the problem again. Hope this will solve others' shut-down as well.
  • Loudwater Level 1 (0 points)
    OK. It just happened to me a couple of times today again (twice restart, once shutdown, all random and the machine was pretty hot). I installed the security update that was released last Friday. Not sure if that was the problem. I reset the SMC and PRAM and NVRAM again, let's see if this helps. Maybe it's time for Apple to give us a new computer!
  • Berry with an "A" Level 1 (0 points)
    Loudwater -

    I don't know if last week's update is an issue with your restart and shutdowns... but two things:

    (1) My iMac never did any random restarts... it only did shut downs. It acted like my MacBook Pro when I let the batter die... it acted as if it had a battery and just shut down.

    (2) Although I'm not sure if last week's update did anything regarding the issue you're having, but I know one thing... shortly after I did the update... I think the same day... my iMac had the weirdest freeze up... basically a kernal attack.... dark gray screen washed down from the top to the bottom with all the different languages, and said I had to hold down my power key to force restart it.

    I think that's happened to me... maybe once since getting this new processor i7. Too much of a coincidence thought ... right after the update last week!
  • Loudwater Level 1 (0 points)
    Berry with an "A":

    I believe the random restart thing was new. Before, it was only plain black screen shutdown - I understood what you were describing, and I'm 100% sure it was the same symptom. I reset SMC, and it just happened again to me today. The machine was scorchingly hot when it happened.

    We are going to bring it in to an Apple Store tomorrow to have it checked. (The customer service, especially senior people, were being ******** and not telling us any useful information.) I'll post back if anything changes on my end.
  • burkanov Level 1 (5 points)
    Paradoxx wrote:
    Hi Burkanov,

    Are you using 3rd party RAM? It sounds like it could be a problem with 'bad' memory.

    No, everything is original.

    Message was edited by: burkanov
  • Michele Smith2 Level 1 (0 points)
    Had the same problem one year ago. Got nowhere, even after bringing my iMac to our local Apple Store. The funny thing is, my computer is a mid-2007, 20" screen iMac, not a new one like yours.

    I had a real ordeal, with kernal panics, etc., until Apple finally gave me a free OS upgrade (to 10.5.4). Then the problem went away, so I really came to the conclusion that it wasn't hardware related after all.

    BTW, the problem spread like a virus to my 2 older computers as well (an "eMac" and an "iBook G4"). Everything cleared up with the upgrade to Leopard.

    Here's a snapshot of my computer FWIW:

    Model Name: iMac
    Model Identifier: iMac7,1
    Processor Name: Intel Core 2 Duo
    Processor Speed: 2.4 GHz
    Number Of Processors: 1
    Total Number Of Cores: 2
    L2 Cache: 4 MB
    Memory: 2 GB
    Bus Speed: 800 MHz
    Boot ROM Version: IM71.007A.B03
    SMC Version (system): 1.20f4
    Serial Number (system): W88063T6X86
    Hardware UUID: 00000000-0000-1000-8000-001EC214AFBC

    NOW, after a year of relative peace, the "spontaneous shutdowns" are starting again. I'm having about 1 or 2 per day.
  • Berry with an "A" Level 1 (0 points)
    micheleandray -

    Although there were "symptoms" or "results" of kernel panic attacks for my issue (this issue) - this is completely different hardware, completely different OS issue. You should apply your comment to a 20" iMac 2 core duo string/subject.

    - - - - - - - - - - - - - -

    Loudwater -

    I am curious though, to hear if you've still been experiencing the issue since you did the SMC reset. Anything new, different, same?
  • Rojer W. W. Level 1 (45 points)
    @Berry with an "A"
    Thanks for your thorough report. My iMac is new and I have had four spontaneous shutdowns since September 2. I will try giving it the cold - hard - boot (and deplete the capacitors, too). I didn't know it was called an SMC reset and not sure why Apple would call this a last resort (, except to save data, which obviously ain't happening if it has already shutdown. But as soon as I get home tonight, I am giving it a try.
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