Black Spots/ Smudges/ Dust Problem with Apple Cinema Displays

my 24" cinema display from 2010 developed dust/ stains in the lower left corner of the display after about 1,5 years in use. see the attached picture. the problem is mostly seen in imacs. there is a long thread in the macroumors forum describing this problem and showing a not easy solution. i'm convinced that there is the same problem with some of the ACD like mine. probably the cause oft his problem is the sealing between display and backlight (see the description by oggy in the above linked thread) which allows that circulating air can bring dust between the two panels. it looks really like a design flaw. if you are in guaranty apple will change the panel. without guaranty no chance of help. but even the panel is changed the problem can occur again. but there are some hints that apple is investigating this problem. please post your experiences how apple is handling your case if you have the this problem.

Hi, I have tried shifting them around, and the problem does seem to follow the graphics card, despite all tests indicating they are both working properly. Any other arrangements will cause a grey screen to come down while starting up and say I need to restart the computer.
Changing the slots for the graphic cards, but keeping the display attached in the right place, would allow the computer to turn on but a window would come up saying that they weren't optimally configured (16x or 8x or 4x speeds). The best configuration remains the one I begun with (slots 1 and 4). The computer will only start properly with the display in slot 4, right hand side looking at the back of the display, and only when it's turned on will it allow me to attach the second monitor, again, only in slot 4, to the left side.
The same would work if the card was in slot 1, but it would tell me they weren't configured ideally so I put the card back in slot 4.
At this point, then (I have also just tried resetting the PRAM by pressing cmdoption+PR when restarting, but no changes) should I reconfigure the graphics card? (If yes, how do I do it?)
Thanks again, Valentina

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    Message was edited by: telelove

    I've been talking about this on another forum too, and I made some pictures in photoshop to describe the problem. Here is what I posted on the other forum:
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    Message was edited by: telelove

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