Imac G5 lcd pressure spots

Is this normal? since the day I brought it home I have noticed a slight fog or what seems to be "pressure" on the four sides of the screen. Is this covered under warranty? In the dark it is more noticable.

I searched through the knowledge base and found an
article that seemed to relate..sorry, did not write
down the number... one article said you could set
your computer to sleep and another article said to
create a totally white background to make the desktop
picture. I chose to set the computer to sleep when
not in use and the dark areas of the screen have
disappeared. Hope this helps. It worked for me.
Sorry but that didn't work for me.. the spots are still there

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