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24" iMac Screen Freezes since 10.6.3 update - pls help!

454967 Views 1,593 Replies Latest reply: Mar 5, 2014 4:31 PM by forevermacintoe RSS Branched to a new discussion.
  • sequera Calculating status...

    sorry....freezing again with OX mavericks and kext fixes.

  • aieronimo Level 1 Level 1 (0 points)

    Thanks very much, Sequera.  Please let us know if things continue to go well (or not).

     

    If folks in general can indicate what iMac version and graphics card they are using (as Sequera did), it is very helpful.  Thanks again.

     

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

     

    Oops -- I posted before your second reply.  Your crash outcome is a real shame.  I'll watch to see how others are faring with Mavericks and the kext fix, and with other iMac and graphics cards.  Thanks again.

  • bobtibb Calculating status...

    iMAC Late 2008

    2.66 GHz Intel Core 2 Duo

    4 GB 800 MHz DDR2 SDRAM

    ATI Radeon HD 2600 Pro 256 MB

    OS X 10.9 (13A603)

     

    Since adding the kext fix from 10.6.2 to Mavericks:

     

    One grey screen freeze while sorting the Mac just after installation.

    Did the kext fix.

    Did fix permissions. This took ages to perform.

    Carried on sorting software under the new set up. Upgrading programs, etc.

    One black screen after three hours of use. Fixed by pressing the power button on back off and on quickly, pressing the esc key and finding that the Mac seemed asleep. Log In screen came up and I logged back in. Mac was still running!

    Went to System Prefs and set the Energy setting to Computer sleep to 'never' but left the display sleep to 3hrs.

    Since then: No freezes . . . yet. If they return I will try the same solution and report back.

    Bob

  • bobtibb Level 1 Level 1 (0 points)

    Actually the mac is an Early 2008 model.

    Bob

  • alexsader78 Calculating status...

    Ok, so this is what happened:

     

    I decided to install Mavericks and guess what? My computer got frozen. I have an iMac Mid 2007, 2 GHz Intel Core 2 Duo, 4 GB 667 MHz DDR2 SDRAM, ATI Radeon HD 2400 XT 128 MB, Serial Number W873538YX85 running OS X 10.9 (13A603).

     

    So, I did the kext fix and after some minutes it asked me to turn the program manually. I did, it took some minutes and it started again. Since then, I used the computer for 5 hours and it didn't want to sleep, but it wasn't freezing which was good. Then, I turned it off and today, after 12 hours I started the machine, it booted normally, but then it got frozen again. So I manually rebooted it and after 15 minutes is running again without problems.

     

    So, I really don't know exactly to say if the Kext Fix has really fixed the problem or not...

     

    I will try to fix permissions too, lets see.

     

    What it bothers me, is the fact that Apple doesn't care about our problem, which it seems that is not a random thing

     

    Thanks everyone for updating here your progress.

  • Hedegaard8 Level 1 Level 1 (0 points)

    Hello everyone,

     

    I have the same problems:

    -Random freezes

    -Random black screen

    -Random beach ball pointer and you can move it around but nothing else

    -Random Striped lines on display

     

    I have upgraded to OSX Mavericks - no change - i.e. still does random freezes.

     

    I have upgraded RAM, I have taken the optical drive out and put in a SSD and thus had fusion drive.

    I then uninstalled fusion drive, put back in the optical drive and installed SSD instead of HD.

    Still freezes just as before.

     

    The worst part was when it went into sleep mode and couldn't "wake up" again.

    I've done clean install of the OS and that fixed that "sleep" problem, but not the random freezes.

     

    I've had mac for about 4 months now- I migrated from the PC world. My IT experience is "expert" in the PC field and obviously "still learning" in the Mac department.

     

    I haven't applied any kind of Kexts or other hocus pocus voodoo that people in here have suggested.

     

    I am suspecting from reading everyones text in here, that the problem is the video card and for some the video kext will solve it, for others, replacing video card fixes it. Thats as close to a common denominator you can get.

     

    Am waiting for confirmation that someone has a 100% fix before I try all the amateurs suggestions of kext updating and blah blah...

     

    Heres my specs:

     

    Model Name:          iMac

      Model Identifier:          iMac8,1

      Processor Name:          Intel Core 2 Duo

      Processor Speed:          2,8 GHz

      Number of Processors:          1

      Total Number of Cores:          2

      L2 Cache:          6 MB

      Memory:          4 GB

    Chipset Model:          ATI Radeon HD 2600 Pro 256MB

  • TK111 Level 1 Level 1 (0 points)

    Amateurs!? You want pros, try a Genius at the Apple Store. I've done it, they've never heard of this. And there is no 100% fix, but the kext replacement has worked very well for a long time and it's no shot in the dark blah blah solution.

     

    My iMac8,1, 2.8 GHz, ATI HD2600 Pro, same as yours.

     

    Had the GPU replaced years ago by Apple while still under warranty. Worked fine for a couple months, then started back with the random freezes. Kext fix solved it. Installed Mavericks Tuesday, no kext fix yet, machine working fine so far after intensive use the last two days. I'm hopeful, but this is not unusual with new OS.

  • Spokes78 Level 1 Level 1 (0 points)

    Hedegaard8, you might want to adjust your attitude a tad.  That kext hocus pocus you refer to works, especially on HD2600.  Use it, don't use it.  That's up to you.  I write this for others.  The kext fix works.

  • Fred1723 Calculating status...

    hedegaard8, read my story on page 95. If you are still in question about the kext fix you might wanna be one of those people who take the "experts" advice from the Genius Bar and just buy a new computer.

  • aieronimo Level 1 Level 1 (0 points)

    For Hedegaard8's iMac and graphics card (8,1 and ATI Radeon HD2600) the kext solution is a 100% fix through Mountain Lion, at least.  I know because I have the same pairing of computer and card, and it never has crashed after I applied the fix.  It's also a quick and easy solution.  Whether the fix still works on Mavericks is what the good sports who have stuck together on this message board for several years are trying to determine now.

     

    It was a generous user named Krzysiu Turek who discovered the fix and posted it in an easy-to-use package with clear instructions.  If not for him, we would have been stuck with machines that crashed at unpredictable intervals.  His kindness extended the lives of these machines by 3-1/2 years.

  • freandc Calculating status...

    I second all aieronimo's statements about how lifesaving the kext fixes have been. Unfortunately, it seems they are not working for me with Mavericks. The console messages I see are as follows:

     

    10/24/13 10:38:07.842 PM com.apple.kextd[12]: WARNING - Invalid signature -67061 0xFFFFFFFFFFFEFA0B for kext "/System/Library/Extensions/ATI2600Controller.kext"

    10/24/13 10:38:16.000 PM kernel[0]: OSMetaClass: Kext com.apple.kext.ATISupport class ATIController is a duplicate;kext com.apple.kext.AMDSupport already has a class by that name.

    10/24/13 10:38:16.000 PM kernel[0]: Kext com.apple.kext.ATISupport start failed (result 0xdc00400a).

    10/24/13 10:38:16.000 PM kernel[0]: Kext com.apple.kext.ATISupport failed to load (0xdc008017).

    10/24/13 10:38:16.000 PM kernel[0]: Dependency com.apple.kext.ATISupport of kext com.apple.kext.ATI2600Controller failed to load.

    10/24/13 10:38:16.000 PM kernel[0]: Can't remove kext com.apple.kext.ATISupport; services failed to terminate - 0xdc008018.

    10/24/13 10:38:16.000 PM kernel[0]: Kext com.apple.kext.ATI2600Controller failed to load (0xdc008015).

    10/24/13 10:38:16.000 PM kernel[0]: Failed to load kext com.apple.kext.ATI2600Controller (error 0xdc008015).

    10/24/13 10:38:16.000 PM kernel[0]: Kext load request buffer from user space still retained by a kext; probable memory leak.

    10/24/13 10:38:16.000 PM kernel[0]: OSMetaClass: Kext com.apple.kext.ATISupport class ATIController is a duplicate;kext com.apple.kext.AMDSupport already has a class by that name.

    10/24/13 10:38:16.000 PM kernel[0]: Kext com.apple.kext.ATISupport start failed (result 0xdc00400a).

    10/24/13 10:38:16.000 PM kernel[0]: Kext com.apple.kext.ATISupport failed to load (0xdc008017).

    10/24/13 10:38:16.000 PM kernel[0]: Failed to load kext com.apple.kext.ATISupport (error 0xdc008017).

    10/24/13 10:38:16.143 PM com.apple.kextd[12]: Failed to load /System/Library/Extensions/ATI2600Controller.kext - (libkern/kext) dependency load failed.

    10/24/13 10:38:16.145 PM com.apple.kextd[12]: Load com.apple.kext.ATI2600Controller failed; removing personalities from kernel.

    10/24/13 10:38:16.000 PM kernel[0]: Couldn't alloc class "ATISupport"

    10/24/13 10:38:17.926 PM com.apple.kextd[12]: WARNING - Invalid signature -67061 0xFFFFFFFFFFFEFA0B for kext "/System/Library/Extensions/ATIFramebuffer.kext"

    10/24/13 10:38:18.000 PM kernel[0]: OSMetaClass: Kext com.apple.kext.ATISupport class ATIController is a duplicate;kext com.apple.kext.AMDSupport already has a class by that name.

    10/24/13 10:38:18.000 PM kernel[0]: Kext com.apple.kext.ATISupport start failed (result 0xdc00400a).

    10/24/13 10:38:18.000 PM kernel[0]: Kext com.apple.kext.ATISupport failed to load (0xdc008017).

    10/24/13 10:38:18.000 PM kernel[0]: Dependency com.apple.kext.ATISupport of kext com.apple.kext.ATIFramebuffer failed to load.

    10/24/13 10:38:18.000 PM kernel[0]: Can't remove kext com.apple.kext.ATISupport; services failed to terminate - 0xdc008018.

    10/24/13 10:38:18.000 PM kernel[0]: Kext com.apple.kext.ATIFramebuffer failed to load (0xdc008015).

    10/24/13 10:38:18.000 PM kernel[0]: Failed to load kext com.apple.kext.ATIFramebuffer (error 0xdc008015).

    10/24/13 10:38:18.000 PM kernel[0]: Kext load request buffer from user space still retained by a kext; probable memory leak.

    10/24/13 10:38:18.360 PM com.apple.kextd[12]: Failed to load /System/Library/Extensions/ATIFramebuffer.kext - (libkern/kext) dependency load failed.

    10/24/13 10:38:18.362 PM com.apple.kextd[12]: Load com.apple.kext.ATIFramebuffer failed; removing personalities from kernel.

     

    I leave it to brains larger than mine to decipher with thanks in advance for any help.

  • Hedegaard8 Level 1 Level 1 (0 points)

    Hey guys,

    I don't mean to cause offence with my attitude. I write a little tongue-in-cheek style. Certainly with no ill intent

     

    However, having said that, surely I must point out that, 97 pages of posts later, there still is no 100% fix that cures everyones iMac in the same range. Some yes, some no, some this, some that.

     

    I'll wait until someone works out a kext for Mavericks and will try that.

    Thanks aieronimo for pointing out about Mountain Lion fix, but thats no good now that I've upgraded to Mavericks.

     

    As for the geniuses at the bar, never met one. They aren't educated technicians, so expecting them to be one, is a little far stretch I'd imagine.

     

    To be fair to Apple, I understand they don't bother with old hardware that is older than 2 years. Its still nice of them to make an OS that we can run quite well.

    iMac, OS X Mavericks (10.9)
  • sequera Level 1 Level 1 (0 points)

    more....

     

    I installed OS Mavericks in imac 7.1 (mid 2007) 2.0ghz core 2 duo , 4gb ram, ATI 2400 , with the kext fix, and fix permisions.

     

    and.... freezes again.

     

    After, I did the same solution of bobtibb. Change computer sleep to "never" in Energy setting, and the display sleep to "3 hours".

     

    Now no freezes.

     

    Hope it works.

  • aieronimo Level 1 Level 1 (0 points)

    Thanks for your comments, Hedegaard8.  But Apple has no excuse in this case.  The first of the 97 pages of posts on this topic is dated March 31, 2010.  The release date on these iMac models (mine is 8,1) is April 28, 2008.  So these machines started crashing 23 months after they were released.  (It happened with a Snow Leopard version upgrade.)  I don't think even Apple believes that two years is a reasonable time for them to abandon a hardware model.  I mean, Applecare goes three years, which implies they think the useful life is at least that long.  In my view, more than three years is reasonable.  Note as well someone along the way posted that the Windows drivers for this graphics card (mine is ATI Radeon HD2600) were updated, as the computer does not crash when running Windows in Boot Camp.  So this is an Apple-specific problem (and a shame).

     

    Krzysiu Turek, can you help us again please, if this Mavericks challenge persists?

  • Pommes Frites Level 1 Level 1 (0 points)

    -> sequera: Did you just update your iMac to Mavericks which already was Kext fixed? Or did you update to Mavericks and - after that - run again the Kext fix procedure?

    Thanks for your reply!

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