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

Close

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

  • All replies
  • Helpful answers

first Previous Page 72 of 120 last Next
  • by swmaster,

    swmaster swmaster Apr 19, 2012 9:35 PM in response to aieronimo
    Level 1 (0 points)
    Apr 19, 2012 9:35 PM in response to aieronimo

    I have two iMac7,1s, both running 10.7.3 with the 10.6.2 ATI kexts. they work perfectly. so did they with 10.6.8.

    just go ahead with the kext fix.

  • by Tardigrada,

    Tardigrada Tardigrada Apr 19, 2012 9:42 PM in response to aieronimo
    Level 1 (9 points)
    Mac OS X
    Apr 19, 2012 9:42 PM in response to aieronimo

    Yep, I confirm this (for ATI GPUs). I also have an iMac 8,1 with 10.6.8 running in 64-bit mode with the 10.6.2 Kexts almost a year now.

  • by Ken Cluff,

    Ken Cluff Ken Cluff Apr 20, 2012 5:51 AM in response to aieronimo
    Level 2 (205 points)
    Apr 20, 2012 5:51 AM in response to aieronimo

    FYI: I have an iMac 7,1. I've been running with the kext fix on OS10.7.3 for several months now without a problem.

  • by goskip40,

    goskip40 goskip40 Apr 20, 2012 12:33 PM in response to Ken Cluff
    Level 1 (0 points)
    Apr 20, 2012 12:33 PM in response to Ken Cluff

    Hello guys,

     

    This is interesting I am sure I read earlier in this very lengthy thread that there was a kernel panic encountered with 10.6.8. Mine is an iMac8,1 so capable of bootimg into 64 bit mode.

     

    Tempted to give it a go, I really dont want to spend £134 un-necessarily.

     

    Many thanks for that.

  • by TK111,

    TK111 TK111 Apr 20, 2012 12:38 PM in response to goskip40
    Level 1 (0 points)
    Apr 20, 2012 12:38 PM in response to goskip40

    Yes, if I remember correctly on my iMac8,1, 10.6.8 when used with the kext fix while running as 32 bit gives the kernal panic. I changed my iMac8,1 to 64 bit and used the kext fix with no problem. But since then, new GPU and Lion with standard Lion kexts and no problem either.

  • by Marno49,

    Marno49 Marno49 Apr 20, 2012 12:47 PM in response to TK111
    Level 1 (0 points)
    Apr 20, 2012 12:47 PM in response to TK111

    Remind me again what your original GPU was?  What was it replaced with?

  • by Brian from VA,

    Brian from VA Brian from VA Apr 20, 2012 12:52 PM in response to goskip40
    Level 1 (10 points)
    Apr 20, 2012 12:52 PM in response to goskip40

    Just to give you reassurance, goskip40, I also have an iMac 8,1 (with ATI Radeon HD 2600 Pro) running 10.6.8 in 64-bit mode with the kext fix, and it has worked fine for me.  I think the only real downside is that whenever you (or someone else) upgrades OS X, you have to re-apply the kext fix.

     

    (I do have a problem where the screensaver won't always start when it should, but I don't think it's related to the kext fix or anything.)

     

    Good luck!

  • by goskip40,

    goskip40 goskip40 Apr 20, 2012 1:30 PM in response to Brian from VA
    Level 1 (0 points)
    Apr 20, 2012 1:30 PM in response to Brian from VA

    Many thanks indeed Brian (and TK111). I am tempted to do this. The other day I dropped the Kext files to my desktop in readiness and then found the bit in the thread about issues with running on 10.6.8

     

    As mentioned I am on an 8,1 system. Have you guys set your systems to boot into 64bit mode by default? Just wondering if the system is likely to panic if it defaults back into 32 bit mode. I guess at that point you can reboot back into 64 bit.

     

    Many thanks again - it is appreciated.!

  • by TK111,

    TK111 TK111 Apr 20, 2012 1:59 PM in response to Marno49
    Level 1 (0 points)
    Apr 20, 2012 1:59 PM in response to Marno49

    My original GPU was ATI Radeon HD2600 Pro replaced with the same.

  • by TK111,

    TK111 TK111 Apr 20, 2012 2:00 PM in response to goskip40
    Level 1 (0 points)
    Apr 20, 2012 2:00 PM in response to goskip40

    I would switch your system permanently to 64 bit. As far as I know (not that far, maybe) there are no downsides to that. I can't remember how to do it, though, whether I saw it in this thread or not, but a google should turn up the procedure. It's a simple thing.

  • by goskip40,

    goskip40 goskip40 Apr 20, 2012 2:40 PM in response to TK111
    Level 1 (0 points)
    Apr 20, 2012 2:40 PM in response to TK111

    Looks fairly straightforward, this link explains http://support.apple.com/kb/HT3773?viewlocale=en_US&locale=en_US

     

    I have booted into 64 bit mode now just to ensure system is stable.

  • by goskip40,

    goskip40 goskip40 Apr 21, 2012 11:36 AM in response to goskip40
    Level 1 (0 points)
    Apr 21, 2012 11:36 AM in response to goskip40

    Well got my kext fixes in place now. I did have one more hang today prior to install. One moment of panic, the system hung on reboot, I dont think the kext helper was responding as I did a kill on the pid for it in the end and the system booted cleanly.

     

    Thanks guys again for assistance.

  • by mediaguru2,

    mediaguru2 mediaguru2 Apr 21, 2012 1:25 PM in response to goskip40
    Level 1 (0 points)
    Apr 21, 2012 1:25 PM in response to goskip40

    Having done the kext fix originally back in early 2011, going to 10.6.6 and having NO freeze ups since then, I decided to move on to 10.6.8 today. I made a very serious error in not checking whether my 8,1 iMac was 32 bit or 64 bit before changing the kext files, which I had saved in a folder from the previous time. So when I rebooted after using kext helper to change the files I got the grayed out screen telling me to restart which I did and it reappeared every time I tried to restart...I though I was screwed.

     

    My solution was to reboot using my original 10.6.1 disc and with that I was able to use my back up mirrored hard drive to start up from. When I got in to that I was able to then get into the internal hard drive and go to the terminal program in utilities and type in the code to switch my computer to 64 bit, which I found online. After that all has been well. What a relief.

     

    I had been holding off and it was only this week that I finally saw enough evidence from forum posters to convince me that the move to 10.6.8 had been totally successful for them. Next upgrade will be to Lion. Not for while though.

  • by goskip40,

    goskip40 goskip40 Apr 22, 2012 1:11 PM in response to mediaguru2
    Level 1 (0 points)
    Apr 22, 2012 1:11 PM in response to mediaguru2

    Yes - exactly the same as yourself. As you may have read I had actually ordered a new GPU for my iMac 8,1 (2008) having been stuck on 10.6.2 for well over a year. I knew the kext fix was good on 10.6.7 to which I upgraded to initially, but then I found that iLife11 would not load.

     

    I was forced to go 10.6.8 but I had read that the kext fix would not work on this release :-(

     

    However, some of the very helpful guys here convinced me to go for it on 10.6.8, so long as I ran in 64 bit mode.  I took it slowly, I switched my machine to 64 bit mode, then changed the default boot mode (for 64 bit) and ran it there for a while. Did a couple of reboots to ensure was good. ps. I had taken a full backup prior to this.

     

    I used the kext helper which worked cleanly within a few seconds, but the reboot did hang which concerned me a little. I needed to kill the kext helper from the Unix prompt before the system rebooted. After experiencing a hang my heart was in my mouth for a few seconds, but was relived to see it boot properly.

     

    So far (24 hours in) no hangs, so I will cancel the GPU I ordered, but will have to remember to do the kext fix when I go to Lion.

  • by LasVegasBones,

    LasVegasBones LasVegasBones Apr 24, 2012 5:14 AM in response to Spokes78
    Level 1 (0 points)
    Apr 24, 2012 5:14 AM in response to Spokes78

    I have Lion on a machine less than ayear old and it is completely frozen.  No response to mouse or pad.  Argh!!!

first Previous Page 72 of 120 last Next