IMac 20" with dark screen corners

Hi folks,
I've got an iMac 20" Core Duo which iI purchased in October 2006. My Applecare has expired.
I've just noticed the tiniest little 'smudge' in the bottom left hand corner of the screen. At first I thought it was dirt on the outside of the screen, but carefully cleaning shows that the screen is spotless.
Has anyone else seen this? Is the display dying, or is there contamination on the inside of the screen? WIll it worsen or is there anything else I can do to improve/fix/stop it?
My lovely, beautiful, iMac!....[stay calm].....

What does the smudge look like. Can you post a photo?
If it's looking like dirt (and not merely uneven backlight, which almost all iMacs have), it could be under the front glass. This is rather easy to fix. The front glass is attached to the computer with magnets and can be lifted off with suction cups. When the glass is lifted off, you have access to the underside of the front glass and to the outside of the lcd panel. Both can be cleaned with a damp microfiber cloth without much risk.
Here's a youtube video that demonstrates the removal:
http://www.youtube.com/watch?v=9cHMHzq5E5I&feature=related
He just brushes the LCD panel, but you may actually need to clean the underside of the glass too. As said, wiping (not hard rubbing) with a damp (not wet) microfiber cloth is okay. Both surfaces are glass and to my knowledge they are not coated. If you use distilled water and newly bought cloth (wipe damp, then wipe dry with 2nd dry cloth) you'll be able to get the surface clean with no residue.
You actually don't need a fancy suction cup like he does, any suction things will work, like a bathrooom towel holder. Just when you pull the top away, don't tilt it too far, just enough to be able to get a hold of the sides like he does in the video and then pull the whole thing away.
If this does not cure it, it's either dirt inside the LCD panel (this can happen too) or a problem with the backlight of the panel, which will both be bad news because it's hard or impossible to fix.
Message was edited by: Shimodax

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