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Q: New iMac 27inch screen flickering/tearing/shutoff
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Nov 15, 2009 8:38 PMby PeterBreis0807,Schwa72 wrote:
My early-2009 24" iMac has been flawless...but Apple's had lots of time to get the kinks worked out of that model!
Well at least my replacement unit has been flawless, if you ignore the glare from the too bright backlighting and the reflections off the screen.
Peter -
Nov 16, 2009 1:52 AMby Eisenzahn,Hi folks, here is a summary of my experiences with this issue.
After doing the PRAM reset with 10.6.1 the flickering disappeared for about a day. Then I installed 10.6.2 and the flickering came back after 45 min running it. Then I reinstalled the OS from the DVD, installed the 10.6.2 update and performed the PRAM reset unfortunately about two hours later the flickering with blackouts appeared again.
But, without doing anything special, the issue disappeared after an hour. Since than (2 days) the computer runs without problems (I shut down the computer every night).
My 14-day return period will end on Wednesday... -
Nov 16, 2009 3:48 AMby fredpontes,Hi folks
After having the problem for some days, doing the resets,confirming the drivers and installing the last update the problem continued. I called today Apple asking what to do and they told me that they knewed the problem (what was a surprise for me) and it was due to a Graphic Card assembling problem. They proposed me to exchange the imac in the store I bought it or send it to technical repair. Of course I will opt for the first solution.
According to what they said today, it seems that we should waste more time trying to find a software solution, because it is hardware.
I will let you know about my next imac.
regards
f -
Nov 16, 2009 5:53 AMby canyonblue,clearly, clearly now i believe this IS a hardware issue. not all, not even a majority of 27 inch macs are having this issue. now in the past similar hardware issues could be fixed by a firmware or software workaround but that is no guarantee with apple being silent on the issue for now. the choices as i see it are return the computer now and get a new one, one of the ones without the issue... or hope that apple finds a workaround with software sometime in the future with the alternative then being a hardware repair to your existing computer. -
Nov 16, 2009 10:27 AMby maquelle,I ask the replacement of my iMac last friday (today was the 14th day).
I think I will receive it this week and today I received an email which says the dispatch is scheduled for 30/11/2009.
Moreover I saw that shipping is within 7-10 business days on french store.
Does it mean this is a hardware problem and they delayed my order to send me a new iMac without flickering problem ? -
Nov 16, 2009 10:45 AMby Schwa72,Grasping at straws here, but here's what System Profiler is showing as my ATI Radeon HD 4850's ROM and EFI Driver versions (Apple menu > About This Mac > More Info > expand Hardware > select Graphics/Displays):
ROM Revision: 113-B9110C-394
EFI Driver Version: 01.00.367
I still haven't seen the flickering issue on my 27" iMac (knock on wood, fingers crossed). It'd be interesting for those who are having the flicker to post their ROM and driver revision numbers. If you do post, make sure you also mention which video card you have so we can compare apples to apples.
