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  • bressst Level 1 Level 1
    Hi everyone,

    Another one month since my last post. No shutdown so far with 12 Gb and my iMac is on 24/7.
    So there is no doubt for me that having 16Gb is the issue.

    Is there someone to say whether this is a RAM issue, an Apple hardware issue and whether this could be fixable by a software update ....

    Hold on... maybe I could try again with the 16 Gb now we have the OS 10.6.5....we never know...


  • tlpresnell Level 1 Level 1
    I have a similar problem, but a little different. My iMac has started to occasionally reboot itself. Any one have a similar problem? Any suggestions?
  • jimbartley Level 1 Level 1
    My iMac is having the same shutdown problem.

    It does it when I am browsing on the Netflix website while using Safari. It also shut down when I browsed Netflix with Firefox. BUT, when I browse the Netflix website using Google Chrome, it has never shut down. Since the last Safari upgrade, it does not shut down quite so quickly, but it does still shut down when I browse Netflix using Safari.

    It also shuts down when I'm using iTunes, especially when I access iTunes data on another computer on my local network. The temperature does not seem to be an issue, because these shut downs occur when the computer has been on for only a few minutes. Other times, when I don't use either iTunes or Safari, the computer can stay on for days without shutting down.

    I took my computer in for a few days to have it looked at and they never saw it shut down.
  • jimbartley Level 1 Level 1
    My iMac shuts down when I use iTunes.
  • peterwillem Level 1 Level 1
    Maybe it is a good idea to summarize your problem and the steps you have taken.
    Use the following link for it, if you have not done so already.

  • jimbartley Level 1 Level 1
    I noticed with the new iTunes that my iMac does not shut down quite as quickly. My wife still says it shuts down on her, but I don't know what software she is running at the time. I did have to download iTunes directly from the Apple website. When I let the software upgrade download the latest iTunes 10.1.1 it shut my iMac down immediately when I tried to open the program.
  • rconard Level 1 Level 1
    My Imac has been doing this for close to a year with no resolution from Apple. It happens either after being in sleep mode or after being shutdown for updates. I've run the "capture data" program and e-mailed into my rep over a dozen times but I haven't received an answer.

    If I don't put the computer in sleep mode, after the thing mellows out, it will run without shutting down seemingly indefinitely. But my power bill is not happy.
  • Rustydude42 Level 1 Level 1
    I have IMAC 27" 2.93 I7 with 16GB of Ram...third party ram.
    I know for a fact that my shutdown was due to bad ram.

    Was using 16GB of third party ram and computer would shut down when it felt like it when opening files usually in photoshop or Illustrator CS5. Removed 8gb of ram from 3 & 4 slot, and it was fine again running 8GB. I went through 3 pairs of 8GB ram sticks before I got it to work. It seems when you run 16GB of ram, computer get's really fussy with Ram. It's been working fine, until this morning...did it twice in a row opening a photoshop file.
    This morning it did it from being asleep all night. Did a few things on it then 10 mins, opened file with photoshop and...boom!

    Not sure if tempature would be a factor, but it got really cold in my office overnignt...heater breaker went. Was prob below 10 celsius in here, when computer shut down.

    I'm thinking to upgrade to better ram possibly, but not sure if Ram is Ram...or there is better quality ram then others...trial and error.

    Just thought I'd share this. It is frustrating when this happens.

    Message was edited by: Rustydude42
  • pedro3178 Level 2 Level 2
    At the moment only samsung OEM RAM will work until the problem is fixed
  • SecrtSqurl Level 1 Level 1

    2.93 I7

    16GB RAM (third party)



    I'm experiencing the same shutdown issues.  It seems to be most prevelant when I am using apple tv.  The Imac was bought in December and had no issues until I went to 16GB RAM.    The machine ran fine for 3 weeks and then started shutting dowm.  I put the original RAM back in and it was fine. Returned the RAM,and went back to the original 8GB and everything was back to normal. 

    Replacement RAM came in and once again it ran good for 3 weeks and then started shutting down when using apple tv again.  How wierd is that.  .  I am currrently running two sticks (8GB) of the third party RAM and it hasn't shut down in two days of heavy use.   I'll replace the current two sticks with the other two third parttyy sticks to see if a stick is bad.  If not, I'm not sure what to do .... 


    Any suggestions?

  • Alien Quattro Level 1 Level 1

    Hi All,


    I am experiencing the same problem. I also am running a 27" IMAC w/ 16GB of RAM. I'm considering doing what bressst did and am going to downgrade to 12 or 14GB of RAM.


    Like many of you, I have also tried:


    1 - Runing the Techtool deluxe from Apple : everything was ok

    2 - Reseating the RAM : problem still there

    3 - Resetting SMC : problem still there

    4 - Reinstalling the OS from scratch on the internal 2nd drive (HDD instead of the SDD) : problem still there

    5 - Deconnecting all peripherals connected to the iMac : problem still there


    My problem seems to only occur when I use Premire Pro CS5. Although, a few times it's happened using other memory intensive apps.


    The odd thing is, my computer does seem to get hot and the fans start kicking in a bit more right before this happens. I've run temerature tests to confirm. Do any of you have the istat pro widget? It's good for checking temps. If so, if any of you would be willing to post the readings of your temps before the crash, I'd provide the same. Perhaps it is an overheating issue.


    What concerns me most after reading these posts is that Apple does not seem to have a solution for this yet. I'd rather not have to go through the process of having my computer out for days on end with no resolution, especially if it's a motherboard or heating issue.


    That being said, "bresst" can you provide another update? I'm going to test running on 14 soon. I'll post the results.

  • Jerry Moreno Level 1 Level 1

    I have been having the same problem. I'm running an iMac (2010) 27" with Lion and 16 GB installed. It's shut down on me three times. After reading this thread, I've dropped it to 12 GB (using the two Apple stickes of RAM). I'll keep everyone posted here as well on the outcome.

  • dannyboyo8 Level 1 Level 1

    Same Prob...16gig of ram...very fickel.  (just coming from a PC first mac)  I have to have my PC laptop running next to me because this mac is so unstable.  this probably makes Gates smile...  I'm going to try pulling 4 gig of ram and see what happens...I'll report back.  BUT it seems to happen more frequesntly when I'm on the web vs CS5.  Oh and a new bug.  Safari keeps shutting down...aggggg.

  • Jerry Moreno Level 1 Level 1

    Hey everyone... Went to down 12 GB on the iMac (from 16 GB maximum) since mid August and no shut down since. It appears my iMac is very sensitive to being at the max amount.