LCD monitor problem

Hi,

I have a Sony 18" LCD monitor. (model SDM-S81)
The monitor shows the darkest black areas as grey or sometimes a grainy
green or dark blue.
The green/blue usually shows up when it's going from normal to grey.

Other colors are normal - even when the black is grey or turning to grey.
Black text on a white page looks nearly normal. The screen image is always
stable - there is no flickering.

I do not believe it is the backlight since the image is still bright and
clear.

If the monitor is left off for a number of days it may return to normal for
a few hours. But, it also has returned to normal after being on all day.

http://tinyurl.com/enjc7

http://www.photohost.org/gallery/data/961/685example.jpg

Any ideas about what may be causing this?

Thanks.
.

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