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Guangzhou, China - same issue here. Has progressively been getting worse since I bought it 6 months ago. Now at the stage where it's all over the screen (greyish marks - in some places looks like someone has run their fingers down the back of the LCD).
Just searched and found all these posts about the problem, so will be calling Apple Support today.
what a pita - especially for the cost of this high end gear!
Just an update from my previous post, as my machine had the grey smudge issue - rang Apple Care - took the machine (iMac 27" - one year old) to the authorised repair centre, new screen ordered on Wednesday this week, new screen fitted today (Friday) and now back at home. Very good screen, no banding, no yellow tinging, no grey misting (hopefully for ever!). First class service from both the Apple Care Tech guy and from the repair centre. Shame it happened in the first place, but the Apple Care service has been first class - thanks. Hope everyone is treated the same way.
I'm having similar problems but I'm also getting something strange
It 1st started with the grey blobs, which you can see against a white background
But It is starting to get some weird ripple effect on it when on grey backgrounds
Which is a real pain as it affects images that I am retouching as I can't tell whats scrren & what's image
Has anyone else had these ripples?
UPDATE. Brought it in to the Apple Store last Thursday. They had it repaired by Friday night! No questions asked and they did tell me that if it happens again they will fix it or replace it under the Apple Care coverage. Way to go Apple. Oh and by the way this was a $600+ replacement/repair so if you don't have Apple Care yet and you are still eligible, GET IT!
An up date on mine.
AmSys collected as they said they would on the Thursday.
Had a text message Friday to say it had been assesed & spare part ordered.
Rang on Monday to say it would be delivered on Tueday - which it was at 10AM.
Screen has been replaced.
No problem with smudges, banding or yellowness - but I'll be keeping a close eye.
No hassle whatsoever from Apple, so I am impressed with that. Just wish it hadn't happened as it has dented confidence, and I'm uncertain as to if it will occur again. As others have said - Applecare is a must for these now in my view.
I am very impressed by the service of AmSys.
The exact same thing here in Greece. iMac 27" bought early summer 2010. I have not yet contacted Apple's Reseller (we do not have an Apple store in Athens) but i will, tomorrow morning, and will keep you posted on what happens.
In any case, it is a shame for Apple to have this same issue on iMac displays and not fix it for over a year now. Amazingly enough the first post on this thread is Jan 2010, one full year ago, and still no official answer on the matter at least to the best of my knowledge.
My problem is that as i see from older posts, even replacing the LCD will not fix it permanently. Can we keep changing the LCD's forever? I was planning on keeping my iMac for 5 years min. How exactly am I supposed to change my display every 3-6 months? Unbelievable...
Good luck to all of us with defective iMacs
iMAC 27. These grey smudge marks started to appear after only a month of use. Took it to the Genius bar and they were so shocked at the extent of the marks, they didn't even question the cause. Replaced the screen straight away. Had the new screen for 2 weeks and the marks are starting again. Clearly, it's not a problem with the screen but something inside the machine behind the screen that is the culprit. I could change the screen as many times as I like but the problem will always return. I'm so annoyed with this machine. I may just have to go back to PC.
It's "nice" to see I am not alone in this problem.
Just realize I got the same problem, probably since some time but only today during reboot (hence, white background).
I realized how big it was on the right top corner this cloud of spot.
it's the 27" and not even 1 years old.
I'll call tomorrow apple care and I will let you know if anything goes right/wrong