Faded horizontal lines on 24inch imac

I have a 2.8GHZ imac 24 inch ser num W87351DPZCV from Late 2007 Just recently I have noticed some light brown faded shadowy horizontal lines on the display. It is not very noticeable unless you have a nice white background (like the new snow leopard screen).
I have checked the inside of the glass panel and cleaned it as well as the LCD screen its self.
This is a smoke free home.
There are 7 dull lines total. They are darkest at the edges and lightest in the center of the screen.
Does anyone have any idea what this is or how to fix it?
THANKS
Steve

Hi Steve
It sounds like your front glass panel which is held on by magnets needs to be removed and cleaning. Many folks have complained about both condensation and a film collecting on the inside of the glass panel because it is not sealed. If your iMac is covered by Apple Care make an appointment with your local Apple Service Provider or Apple Store and have it cleaned, if not see the many (some good and some bad) DIY video's in the YouTube link below and do it yourself.
http://www.youtube.com/watch?v=frfzESC-ahM
Dennis

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