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beachmusic

macrumors regular
Original poster
Jan 12, 2013
233
9
St. George Island
Maybe I have this in the right forum now. I have a mid 2010 iMac. I noticed this stain or whatever on the upper righthand corner. Can anyone tell me what it might be? I have taken the glass off and cleaned both sides and that didn't help.
 

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More than likely dust that has been sucked up inside the LCD itself. It's practically baked onto the glass part of the LCD. The LCD screen is layers (like a sandwich) of 3 plastic sheets and the actual LCD (glass bit). I had the same problem on a 2009 iMac. It first appeared on my iMac in 2010. It was way worse than yours though, and got really bad last year. I found a replacement on ebay (you have to get an LCD that is compatible) for around €200.

On a grey or white screen you can really see it. It was in the centre of my screen - so it interfered with colours when I was working on projects.

Yours is kinda out of the way though, so you might be able to live with it for another while.
 
I've had this problem on a mid-2011 iMac, I believe it was.. I had to take it in to Apple to fix it a few times. They ended up giving me a new iMac after the first time, because whoever worked on my computer scratched it up.

The second time I took it in, the guy told me I should keep an air purifier near the iMac, which I did/do.

The third time I took it in, the guy tried to tell me it was my fault and that water must have been spilled on the iMac or it was in a very humid room. They ended up fixing it after I told him he was full of ****.

So, what I gathered from the folks at my local Apple store was that, as Mossy said, the dust gets inside the panel from that vent in the top/back of the iMac and it seeps through the panel since it's just magnetized.

SOoo.. I got a new iMac.. which doesn't have that vent at the top and is secured with an adhesive.. and now it's on all 4 corners, plus two more areas at the bottom, of the screen, about one inch to the left and one inch to the right of the Apple logo.

I will be taking it in, but I am going to wait until after the holidays.
 
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