DazzaG

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

I don't know if this is just coincidence or not, but since updating my iMac to 10.6.3 it keeps on crashing. On 3 separate occasions today, whilst using my Mac the screen has gone completely black with thin white lines down it.....see pic below:

http://picasaweb.google.com/lh/photo/6SYzhCgVYEU5TBKqRfOQ1Q?feat=directlink

The fans and hard disk are still running but it will not respond to any keyboard or mouse presses - I simply have to turn it off by holding the power button in.
It will then restart as usual.

Anyone got any ideas? Do you think that if I was to re-install Mac OS X from my original install disk it could solve the issue?

Thanks

Darren

24" intel imac 2.8Ghz, Mac OS X (10.6.3)

Posted on Mar 31, 2010 2:43 PM

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

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  • by morpho,

    morpho morpho Jun 29, 2011 4:53 PM in response to Harkaitz
    Level 1 (0 points)
    Jun 29, 2011 4:53 PM in response to Harkaitz

    Harkaitz wrote:

     

    I remembered that when I installed Lion and tried the kexts, the Lion kernel was working on 64 bits.

     

    <cut>

     

    On 64bit mode the 10.6.2 Kexts work like a charm.

    Funny thing is they should panic also in x86_64 mode, otherwise there is something *REALLY* wrong in the i386-only portion of the code. And that might even be the root cause of all this mess.

     

    Has anybody tried to run "vanilla" 10.6.8 (ie. without the 10.6.2 kexts) in 64 bit mode?

  • by Harkaitz,

    Harkaitz Harkaitz Jun 29, 2011 10:47 PM in response to morpho
    Level 1 (0 points)
    Jun 29, 2011 10:47 PM in response to morpho

    I havent tried the 10.6.8 vanilla drivers on 64mode BUT some users reported that the freezes persist on lion (and its 64bit kernel+kexts) so I doubt they are "freeze free".

  • by Backspin,

    Backspin Backspin Jun 30, 2011 12:12 PM in response to Harkaitz
    Level 1 (18 points)
    Jun 30, 2011 12:12 PM in response to Harkaitz

    Booting 10.6.8 in 64-bit mode with the 10.6.2 kexts works for me too. 32-bit mode crashes on boot with a kernel panic.

  • by Tazthed,

    Tazthed Tazthed Jun 30, 2011 1:20 PM in response to Harkaitz
    Level 1 (0 points)
    Jun 30, 2011 1:20 PM in response to Harkaitz

    Thanks Harkaitz!

     

    This forum is GREAT for helping others, when Apple doesn't want to fix this problem !

  • by Tazthed,

    Tazthed Tazthed Jun 30, 2011 1:50 PM in response to Tazthed
    Level 1 (0 points)
    Jun 30, 2011 1:50 PM in response to Tazthed

    * Forget this message *

     

    Message was edited by: Tazthed

  • by k3bs,

    k3bs k3bs Jun 30, 2011 2:02 PM in response to morpho
    Level 1 (0 points)
    Jun 30, 2011 2:02 PM in response to morpho

    I am running 10.6.8 in 64bit mode. I have a 7,1 imac with 2600xt -> just had the usual freeze again

  • by k3bs,

    k3bs k3bs Jun 30, 2011 2:07 PM in response to nekosaur
    Level 1 (0 points)
    Jun 30, 2011 2:07 PM in response to nekosaur

    Could someone share the 10.6.2s ATI* from a 7,1 iMac please? I am willing to try them on my 10.6.8 / 64bit. I have tried the 8,1 that were posted earlier in this thread, but as nekosaur pointed out - you will get a kernel panic.

  • by Harkaitz,

    Harkaitz Harkaitz Jun 30, 2011 11:48 PM in response to k3bs
    Level 1 (0 points)
    Jun 30, 2011 11:48 PM in response to k3bs

    I installed the 10.6.2 kexts on a 7.1 imac with 10.6.7 an they worked. They should work for you too.

     

    Has the 7.1 imac the ability to boot on 64bit?

  • by k3bs,

    k3bs k3bs Jul 1, 2011 12:36 AM in response to Harkaitz
    Level 1 (0 points)
    Jul 1, 2011 12:36 AM in response to Harkaitz

    You are right, i am not in 64bit mode.

     

    I've added the flag in Boot.plist and the kernel.log showed me: "64 bit mode enabled" at the top, but from looking at Sytem Profiler/Software i can see that "64-Bit-Kernel and -Extensions" is still "NO".

     

    So there is a chance that the kexts posted here may work on this 7,1 iMac running 10.6.8 if i only get 64bit to test it out. But maybe 64bit isnt even possible on this machine, i dont know..

  • by k3bs,

    k3bs k3bs Jul 1, 2011 1:53 AM in response to k3bs
    Level 1 (0 points)
    Jul 1, 2011 1:53 AM in response to k3bs

    Just found out: 7,1 can not be boot in 64bit, never ever

     

    Downgrading to 10.6.7 and applying the 10.6.2 kexts seems to be the only option. Haven't tried, but i will now.

     

    Since 10.6.8 is possibly the last update before Lion (and there was nothing but AppStore crap in it) i will downgrade and wait for 10.7 to be released.

  • by Harkaitz,

    Harkaitz Harkaitz Jul 1, 2011 2:06 AM in response to k3bs
    Level 1 (0 points)
    Jul 1, 2011 2:06 AM in response to k3bs

    I´ll install Lion DP4 on my other mac (imac 7.1 with ati card). Hope to tell you something today (maybe Lion works on 64 bit on the 7.1 or it can manage the 32bit kexts of the 10.6.2).

  • by Tardigrada,

    Tardigrada Tardigrada Jul 1, 2011 2:23 AM in response to Harkaitz
    Level 1 (9 points)
    Mac OS X
    Jul 1, 2011 2:23 AM in response to Harkaitz

    Thanks Harkaitz!

     

    An easier way to switch to the 64 bit kernel is to enter this into Terminal:

     

    sudo systemsetup -setkernelbootarchitecture x86_64

     

    http://support.apple.com/kb/HT3773

  • by k3bs,

    k3bs k3bs Jul 1, 2011 3:18 AM in response to Harkaitz
    Level 1 (0 points)
    Jul 1, 2011 3:18 AM in response to Harkaitz

    Thank you Harkaitz! Looking forward to hear from you!

     

    I just booted my downgraded 10.6.7 and could successfully apply the 10.6.2 kexts. Now lets see how it goes. Finally can do some work again without being scared to freeze any moment...

     

    For reference, here are some version numbers of ATI2600Controller.kext i came across

     

    10.6.8 = 1.6.36

    10.6.7 = 1.6.26

    10.6.2 = 1.6.6

  • by Tardigrada,

    Tardigrada Tardigrada Jul 1, 2011 4:16 AM in response to k3bs
    Level 1 (9 points)
    Mac OS X
    Jul 1, 2011 4:16 AM in response to k3bs

    k3bs wrote:

     

    Just found out: 7,1 can not be boot in 64bit, never ever

    Does the iMac 7,1 have a 64 bit EFI? This way you can check in Terminal:

     

    ioreg -l -p IODeviceTree | grep firmware-abi

     

    If the result looks like this you may have a chance using some tricks:

     

        | |   "firmware-abi" = <"EFI64">

  • by k3bs,

    k3bs k3bs Jul 1, 2011 5:26 AM in response to Tardigrada
    Level 1 (0 points)
    Jul 1, 2011 5:26 AM in response to Tardigrada

    thanks for that command! yes, i have a 64bit EFI

     

    $❯ ioreg -l -p IODeviceTree | grep firmware-abi

        | |   "firmware-abi" = <"EFI64">

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