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iMac freezes

27766 Views 63 Replies Latest reply: Jul 16, 2012 1:11 AM by air-ship RSS
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Ghozer Calculating status...
Currently Being Moderated
Jun 5, 2010 5:23 PM
Anyone know what might be wrong here. At least once or twice a week my 2010 i5 iMac freezes on me forcing me to power off and restart. Today when it happened I noticed that the top of the monitor was scorching hot. I've never paid attention to that before. Could that be a symptom?

I've run verify disk, repaired permissions, used Onyx and the Apple Care tech tools disk and everything checks out ok.

It's never frozen while using it only after some period of inactivity. Any thoughts?
iMac 2.66 i5 Quad with 8 GB RAM, Mac OS X (10.6.2), Nikon shooter
  • a brody Level 9 Level 9 (62,005 points)
    Currently Being Moderated
    Jun 5, 2010 6:32 PM (in response to Ghozer)
    Stop using Onyx.

    But more importantly find out if the RAM has gone bad, or your disk is too full*:

    http://www.macmaps.com/badram.html
    http://www.macmaps.com/diskfull.html

    - * Links to my pages may give me compensation.
    An Apple user since 1981, Mac OS X (10.6)
  • rkaufmann87 Level 8 Level 8 (40,500 points)
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    Jun 5, 2010 7:11 PM (in response to a brody)
    Out of curiosity why do you advise against using OnYx?

    Thanks in advance,

    Roger
    iMac and Macbook Pro, Mac OS X (10.6.3), iPhone 3GS Airport Extreme Airport Express
  • a brody Level 9 Level 9 (62,005 points)
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    Jun 5, 2010 7:15 PM (in response to rkaufmann87)
    If used at the wrong time, it can make it impossible to launch any applications.
    An Apple user since 1981, Mac OS X (10.6)
  • rkaufmann87 Level 8 Level 8 (40,500 points)
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    Jun 5, 2010 7:24 PM (in response to a brody)
    So are you saying in general don't use it or were you making the statement for the OP's current problem?
    iMac and Macbook Pro, Mac OS X (10.6.3), iPhone 3GS Airport Extreme Airport Express
  • FrankHoldem Level 1 Level 1 (10 points)
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    Jun 6, 2010 5:10 PM (in response to Ghozer)
    i'm noticing this identical behaviour on my 27 inch core i7 imac. I've used the built-in diagnostic tools and it reported that all is well. I've checked my disks using Disk Utility and all is well.

    I've even had the lock up occur while booted from the install DVD, so that tells me that it isn't anything related to my OS installation or setup.

    And like you, it seems to only happen during idle moments. It hasn't yet happened while I'm actively doing something on the machine. That could be a coincidence though, i'm not sure.

    I just phoned Apple support and they said I have to take it to a tech centre for further diagnostics. Hopefully they are able to get to the bottom of this problem.
    27 inch core i7 imac, Mac OS X (10.6.3)
  • a brody Level 9 Level 9 (62,005 points)
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    Jun 7, 2010 5:24 AM (in response to rkaufmann87)
    Both. The only time to use it is if you know what you are doing, and have a backed up system are willing to risk it failing more than helping.
    An Apple user since 1981, Mac OS X (10.6)
  • rkaufmann87 Level 8 Level 8 (40,500 points)
    Currently Being Moderated
    Jun 7, 2010 6:39 AM (in response to a brody)
    Got it, thank you!
    iMac and Macbook Pro, Mac OS X (10.6.3), iPhone 3GS Airport Extreme Airport Express
  • FrankHoldem Level 1 Level 1 (10 points)
    Currently Being Moderated
    Jun 7, 2010 8:32 PM (in response to Ghozer)
    Ghozer,
    question for you: does the locking up occur while you are working on the computer? Or only when you've left it for a bit?
    27 inch core i7 imac, Mac OS X (10.6.3)
  • FrankHoldem Level 1 Level 1 (10 points)
    Currently Being Moderated
    Jun 7, 2010 10:49 PM (in response to Ghozer)
    it seems we're not alone with this sort of issue. There are similar postings at the following thread:

    http://discussions.apple.com/message.jspa?messageID=11631251#11631251

    so far my lock ups have only occurred when the computer is idle, never when I'm working on it. So if I leave the computer and it only has one or two things running (eg say a web browser and chat window) then most likely when I come back it will be frozen.

    If, however, I run many apps, like apache, and mysql, and rails, and leave those running, then it makes it through the night and is still running just fine when I come back in the morning.

    I was hoping that it might be related to the energy saver setting 'Put the hard disk(s) to sleep when possible', but I turned that off earlier tonight and I experience a lockup since then.

    I have two USB 2.0 external disks and a USB 2.0 flash drive plugged in. I will try unplugging those and see if the computer still locks up.

    Oh, and yesterday, I did get a lockup after having run Disk Utility by booting off of the install disk. Disk Utility reported all was well...then i just left the computer for a few minutes and came back and it was locked. So that tells me that my problems isn't a software conflict or anything like that on my install of Snow Leopard. But it could be a firmware issue or an issue with Snow Leopard.

    Anyone have any theories?

    I spoke to Apple yesterday and the only thing they were able to suggest was to take it for service. I'm not convinced that its an isolated issue with my computer though.
    27 inch core i7 imac, Mac OS X (10.6.3)
  • Sergio Lubezky Calculating status...
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    Jun 7, 2010 11:00 PM (in response to FrankHoldem)
    Same thing happening to my one-week-old 27" i5. In my case it freezes and I get a little round multicolored ball as a mouse pointer and the only way to go is to push the button and turn it off.

    It happened 4 times so far this evening. I also have two external hard disks, but I cannot afford not to have them, all my photos are there!

    My computer freezes when I run lightroom and photoshop, or lightroom and safari at the same time.
    Imac, iMac 11,1 Core i5, 2.66GHz
  • rkaufmann87 Level 8 Level 8 (40,500 points)
    Currently Being Moderated
    Jun 7, 2010 11:52 PM (in response to Sergio Lubezky)
    Sergio,

    Stop turning off your machine that way! I believe what is occurring is you are simply running out of memory. Run Activity monitor and see where you memory is being used. Photoshop, Lightroom and Safari all use a lot of memory and if you use them all at the same time you will get to a point where your machine run's out of available RAM and has to do memory swapping. Memory swapping is very slow and would explain your spinning beach ball. I suspect if you upgrade the RAM in your machine that will take care of your problem.

    You are doing more damage than good by force shutting it down so please stop it before your damage your OS.

    Regards,

    Roger
    iMac and Macbook Pro, Mac OS X (10.6.3), iPhone 3GS Airport Extreme Airport Express
  • a brody Level 9 Level 9 (62,005 points)
    Currently Being Moderated
    Jun 8, 2010 4:59 AM (in response to Ghozer)
    Frank and Sergio,
    Please start a new topic thread here:

    http://discussions.apple.com/forum.jspa?forumID=1110&start=0

    You'll get a wider audience and won't confuse Ghozer with solutions that don't apply to them. Similar issues, don't necessarily mean similar cause. Especially if the solutions offered here fix Gozer's problem, and they don't fix yours.
    An Apple user since 1981, Mac OS X (10.6)
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