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

456338 Views 1,594 Replies Latest reply: Apr 18, 2014 10:38 AM by Phil_O_ RSS Branched to a new discussion.
  • danni l Calculating status...
    Well... Updated to 10.6.7 earlier this evening, and all was looking good. Didn't deliberately stress my machine, but did double-check that my most used apps functioned as expected. No problems, and I was good for a few hours. And then just now, while simply reviewing a string of previous emails in Mail--bam, a freeze. Same as prior to the graphics kext fix (which did fix and eliminate my freezes). Cursor moves but can't select, unresponsive keyboard, background processes still running, hard power-down necessary to exit. I'll give it another day, but next freeze, I'll be going back to the 10.6.2 kexts.
    Mac OS X (10.6.7)
  • CWGuide Level 1 Level 1 (135 points)
    I updated to 10.6.7 this morning. I left my mac running all day while I was out and then this afternoon I've used it to record some audio and watch some HD video on YouTube while uploading a huge file.

    With the new update I noticed a huge improvement in safari loading speeds. After implementing the fix safari had been having trouble scrolling but now it's noticeably smoother. Even better, HD video on YouTube is now MUCH smoother. Before the update I couldn't play 1080p videos at all. They stuttered and were unwatchable. Now I'm watching the same vids fine.

    Also, and most importantly, NO FREEZES SO FAR! I'll let ya'll know if it does, knock on wood.
    iMac, Mac OS X (10.6.6), Running 10.6.2 graphics drivers
  • Tazthed Level 1 Level 1 (0 points)

    You say that you *implemented the fix* - do you mean the fix from this thread with the kext-files or the new update?

    Message was edited by: Tazthed
  • CWGuide Level 1 Level 1 (135 points)
    Yep. I replaced the kext files. When I updated to 10.6.7 I thought about replacing them with the 10.6.6 files before installing but didn't and they still updated fine!
    iMac, Mac OS X (10.6.6), Running 10.6.2 graphics drivers
  • Tazthed Level 1 Level 1 (0 points)
    Okay thanks.

    I am actually interested to know if APPLE has fixed the problem without us doing anything with the kext files at all
  • CWGuide Level 1 Level 1 (135 points)
    The update replaces the kext file so anything I did is replaced. So basically if I update and you update at the end both our drivers will be the same.
    iMac (Late 2007), Mac OS X (10.6.6)
  • nekosaur Level 1 Level 1 (0 points)
    All was well for about 2 hours until late last night.

    HARD FREEZE. Still able to move the cursor, just not able to click or interact with the screen. Same as before. The drivers were indeed updated, but Apple did not address this issue in 10.6.7.

    The (kind of good) news is that the 10.6.2 driver kext fix still works. Overwrote the new drivers via the tried and true fix and the machine has been stable again all day.

    Looking forward to Lion. Pretty sure they will not devote any time to resolving this issue for 10.6. I can only hope that 10.7 is stable - it might have the same issue. Then we will have a real problem, because there will not be any stable drivers to use. Not sure if it would be advisable to overwrite kext files from a previous operating system!
    Aluminum iMac 2.0 GHz Intel Core 2 Duo, Mac OS X (10.5.6), 4.0 GB RAM
  • Tazthed Level 1 Level 1 (0 points)

    *It seems like the new update 10.6.7 does NOT fix the freezing problem!*

    *Therefore, go to: and REPORT the problem!*

    *To those of you who have fixed the problem by replacing kext-files - you SHOULD ALSO report the problem to Apple!*
  • balintalovits Calculating status...
    My iMac 8.1 was great all day. No freeze. But tonight same **** happend as before.

    I think ******* apple does not even read this **** thread so its completely useless just as reporting the problem over and over again...

    **** YOU APPLE!
    iMac 24 8.1, Mac OS X (10.6.6)
  • Vurey Calculating status...
    nekosaur wrote:
    It looks like the ATI Radeon 2400 drivers were updated for 10.6.7 by Apple on January 27th, 2011. (Old kext version was, new version is

    Looking at the ATI Radeon 2400 kext from OS X Lion 10.7, it is showing a version number of 7.0.52

    Could this be a more up-to-date driver?
    iMac 7,1 (20", 2Ghz, 4GB), Mac Mini 1,1 (2Ghz, 2GB), Airport Extreme and Drobo, Mac OS X (10.6.6)
  • jmanwee Level 1 Level 1 (20 points)
    this is VERY VERY disappointing people, man i hope Lion will not have this problem but still Lion is not an excuse.

    Why in the world should i be freaking using 10.6.2 when 10.6.7 is out
  • CWGuide Level 1 Level 1 (135 points)
    I have still encountered no freezing. I'm going to check to see if my Kext files actually updated
    iMac (Late 2007), Mac OS X (10.6.6)
  • CWGuide Level 1 Level 1 (135 points)
    hmm interesting. After looking at the kext file (ATI2400Controller) it says it was last modified Friday, January 28, 2011. I THINK that's when I replaced the file so that means that I'm running the old files still. But what I said before still stands. I have noticed great improvements in performance. Weird!
    iMac (Late 2007), Mac OS X (10.6.6)
  • Vurey Level 1 Level 1 (25 points)
    I've just updated from 10.6.6 (with the old 10.6.2 ATI 2400 kexts) to 10.6.7

    As soon as I updated I checked the version of the ATI 2400 kext and it had been updated from the working 1.6.6 version to 1.6.26 that has been causing problems since OS X 10.6.3

    I didn't wait around to see if it would cause any freezes. I used the old trick as discussed and reverted back to the working drivers. So far so good.

    Still, I am curious about these 10.7 Lion kexts. Perhaps if I were a braver man...
    iMac 7,1 (20", 2Ghz, 4GB), Mac Mini 1,1 (2Ghz, 2GB), Airport Extreme and Drobo, Mac OS X (10.6.7)
  • PeterBreis0807 Level 7 Level 7 (27,455 points)
    Start up off the Installer DVD 1 holding down the D key.

    This will put it into Diagnostic mode.

    Run the tests holding down the L key to make it loop.

    Let it go for a few hours and note the Error messages if any.

    Mine was doing the same thing and it was a HD fault.

    Hopefully you have AppleCare and it is still current. You should not buy an iMac without it.
    Aluminium iMac 24" 2.8Ghz, Mac OS X (10.6.6), The closest you'll ever get to there, is here.
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