Black streak appearing on top left

I have a slight black line on the top left of my iMac 21.5" screen. It looks like there is something pushing up against the screen. never noticed it until yesterday and now I can't stop looking at it. Also have tried to wipe the screen and it is not a cosmetic. Does not come across too good in the photos but trust me it's a lot more visible in person. Does AppleCare cover this?
http://a.imageshack.us/img153/4104/screenshot20100908at615.png
http://a.imageshack.us/img689/9192/screenshot20100908at616.png
Message was edited by: grimm24

LCD panels have problems with something called image persistence, which is a little like burn in on a CRT, except it happens a lot faster in an LCD, and it also goes away after a short while. It looks like you may have had an area of dark content displaying there for a few minutes and now against neutral colors the persistence is showing through. Try opening a blank page in Safari or TextEdit and maximizing it for a few minutes and see if you still see the black area.
Also you may take a look at this Apple Support Article:
http://support.apple.com/kb/HT2807
If this doesn't fix your image problem, by all means, Apple should cover the cost of installing a new LCD as this should be considered a defect.
Regards,
-Ryan

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