There are to big "rings" appearing in the middle of my iMac 27" screen.

There are to big "rings" appearing in the middle of my iMac 27" screen.They are one visible when the screen is dark. Its very annoying. Does anybody know how i can get rid of these ring-shaped marks in the middle of my screen?

If the marks are on the glass rather than the actual screen, it's an easy job (if you are careful) to remove and clean the glass. Not sure of the implications on your warranty, if you're still covered.
Here's a short video. I've done it a few times on various Macs without problems. I'd turn the Mac off before doing it.
http://www.youtube.com/watch?v=yeAZqw-494Q

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