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Excellent, thanks for reporting this issue, please keep us posted on what feedback you get...
We are all waiting on a official fix for this issue, it dents my confidence in Apple that this is still an issue...
I just spoke with the folks at AppleCare (Tier 1 and then Tier 2), and sent off full log files and a detailed description of the issue. I will hear back from my Tier 2 agent next week after he receives a response from Engineering.
Full disclosure: I am an Apple Certified Technician, and provided my certification ID (along with GSX sold-to ID) to the agent I spoke with. I was very detailed in the issue, and I HOPE this will provide some gravity and drive some focus to this issue.
If/when I hear back, and assuming the information I hear isn't subject to non-disclosure, I'll post what was said, if anyone is interested. Hang in there, guys. I love my iMac and am hoping for a fix, too.
Meanwhile, I'll be using the kext replacement (10.6.2 version), and I recommend you do the same, if you're comfortable doing so. Understand that this recommendation is in no way approved, tested, or condoned by Apple. I'm not affiliated with Apple in any direct way and am only speaking for myself.
So i thought I would update you all on my own escapades with screen freezing ****. I am afraid there is no fix at the end of it!
Updated to 10.6.7
Installed SMC fan control to monitor the temp and increased the fan speeds but screen freezes are fast and furious when doing anything processor intensive. (BTW I am convinced this is a heat issue)
Used the Nvidia display drivers from Mac 10.6.0 which worked really well in terms of stopping the freezing but unfortunatley appears to break core image (i think). Screen savers broken and folder animation jerkey.
Rolled back to 10.6 then up to 10.6.2 but still freezing
Rolled back to 10.6 no freezes I could live with this but i cannot install magic mouse drivers, safari 5 which is frustrating.
I am going to open it up and see if there is alot of dust inside it next, hey i am out of warranty so nothing to lose.
Failing that i will be going back to the shop and seeing what they say, I am regretting not having apple care. My gut feeling is that the graphics card is cooked and cannot cope with even the smallest heat build up
Ok, so here's an update: I heard back from Apple today, after the engineering staff looked at my logs, heard my story, etc. They believe I am experiencing a hardware failure, which is obviously not caused by the newer drivers, but exposed by the newer drivers (the problem was always there, but the newer drivers utilize the card in a way that exposes the failure). This makes sense, although, I must again stress that I'd tested my machine using the ASD tool (available to Apple Authorized Service Providers) in loop mode overnight without ever seeing a failure.
This means, if the engineers are right, that at least in MY case (and your mileage may vary), that I need a repair. I would HIGHLY advise you all to contact AppleCare and ask to have your LOGS COLLECTED. Do this IMMEDIATELY AFTER A FREEZE AND RESTART. If you do so, the recent logs will indicate a failure, and you can receive service easily and quickly, assuming your issue is similar to mine.
For those of you OUTSIDE of warranty, it's likely that if your problems are truly hardware related, you will probably never see a "fix", because one doesn't exist. I don't know what that will mean when Lion is released, but I doubt it will be good..
They believe I am experiencing a hardware failure, which is obviously not caused by the newer drivers, but exposed by the newer drivers (the problem was always there, but the newer drivers utilize the card in a way that exposes the failure). This makes sense, although, I must again stress that I'd tested my machine using the ASD tool (available to Apple Authorized Service Providers) in loop mode overnight without ever seeing a failure.
IOW: "we know this is a regression, but since we're so busy working on Lion we will never fix this and instead tell people it is an hardware fault, even if it occours on different GPUs and different Mac models".
This is the last straw for me: I can't afford to play with the kernel each and every time an update is released and I can't afford buying a new iMac either.
I guess this is "Goodbye Apple, welcome back Dell and Debian".
"For those of you OUTSIDE of warranty, it's likely that if your problems are truly hardware related, you will probably never see a "fix", because one doesn't exist. I don't know what that will mean when Lion is released, but I doubt it will be good.."
I am deeply disappointed by Apple if this comes to be their only answer to this issue. And I am quite frustrated also with the problems associated with the new MBP (early 2011) I just bought. Both of my computers, the iMac and the MBP, have some serious hardware problems that Apple will not recognize. From the standpoint of the customers, I guess there's only one solution left. A solution that means getting together to force Apple to oblige to its responsibilities.
I own an early 2008 24" iMac experiencing the same issue. Luckily it's under AppleCare, so I brought it into the fifth ave apple cube genius bar for repairs. They have had it for a few days now and have not been able to reproduce a crash using the apple stress test. Apparently the system hardware passes all diagnostic checks, so unless they can trigger a crash they will return the unit to me as is. Does anyone have any advice for activities that are known to trigger a freeze? In my experience it was usually simple web browsing that set it off, but other than that I can't pinpoint a single cause.
Either way, I specifically referred the apple genius handling my repair to this thread. Hopefully that may trigger some further insight from Apple management into this issue that seems to be quite prevalent.
Mine is an iMac8,1 system serial YM836*ZE3. Crashes always involve Safari as a minimum (usually with Mail in the background). If I do a software update or set up as a new user on anything beyond 10.6.2 it works faultlessly for about 3, maybe 4 days. Then freezes start, sometimes with mouse movements and a frozen screen (time stuck), sometimes screen switches to some blank or lined screen. Hard reset required, then freezes every few hours. Sometimes GPU crash log recorded by Console, sometimes not.
SmcFanControl did appear to alleviate the problem, so one might think it was a temperature/hardware issue, but the new user/new update and ~4 days fault free operation would make you think it might be a memory leak? Who knows? Only thing for certain is that the 10.6.2 drivers get around the issue. But I guess a lot of iMacs must be unaffected, else it would be reported more widely? So maybe just a limited hardware version? Or perhaps a corrupt firmware issue (don't know how to reset that one?). Other resets don't change behaviour (SMC, PRAM). All very strange, very annoying/disappointing/frustrating. But keep reporting... I guess. And a big thanks to this thread again.
Hi there Simon,
Although this is my first post in the forum, I was reading This tread the last couple of weeks over and over again.
I got the same system as you and the same problem.
It started with spontaneous crashes with funny-colours-screen... I tried everything. AHT didn't show anything, drive genius neither. I tried reinstall, boot from external drive, downgrade the OS and nothing. Even worse - now every time I start my iMac I have like less than 5min before it crashes again, and opening safari makes it even faster (the crash I mean).
I tried resettingm SMC and PRAM - no effect.
I found something interesting though, I did that thing, I can't remember the name, when you press down the iMac button and connect and disconnect the cable - it boosts the fans. So that helped. Now I can use it without problems(not mentioning the noise).
I don't know if it is the Graphic Card or something else so if someone has an idea - pls share.
Thanks and thanks for the tread, really, considering the time we are discussing that should show apple that this is not a single problem.
Message was edited by: ddelch
A quick update on where I am with my machine.
After having the hard drive replaced i was still getting the crashes. Since then, it has been back with the repair guys for 3 days now and they haven't been able to replicate it, as usual!
So now, they are going to swap out the logic board and graphics card, so i will update you as to whether it has worked or not.
A quick update to my iMacs status. It's still at the genius bar, and they have still been unable to reproduce the issue. According to my last discussion with the genii, they have forwarded my issue to Apple corporate engineering and are awaiting their input before proceeding further. As soon as they give me any news I will post it here. Ultimately it sounds like they are set to replace the logic board and gpu, but are hesitant to do so unless they see it crash in person.
After over a week of trying to replicate the issue, the genius bar was still unable to get my iMac to freeze up. However, after consulting with apple engineering they decided to replace my graphics card. The fact that I snapped a picture of the weird stripes on my screen with my iPhone seemed to be enough evidence for them despite their inability to crash it themselves. I also gave them a direct link to this thread. Anyone still under AppleCare, I would suggest doing the same thing. Snap a shot of your frozen screen, bring you Mac in and refer the geniuses to this thread. I'm picking my machine up shortly, hopefully this resolves the issue.
So after 2 weeks at the apple store. I have an answer . They want to replace the graphics card and the LCD at a cost of £400 . Not very pleased for a machine that is under 2 years old to be honest. It also sounds like they are just randomly swapping parts to make the problem go away!
Not sure what to do now. My faith in apple is badly dented and I cannot really afford to pay for this