Sony G200 Yellow Screen :S!

Hi all,
i have a slight problem which ive had for about a year now,
i have a sony multiscan g200 17" monitor, there is a tv with
a metal base about 2" to the top right corner, my monitor is a
pale yellow colour, im not sure if its to do with magnetism as
i cant move the tv because its fixed to the wall on a tv stand
i have tried Degaussing but it dosent work is there anything i can do
to stop this? i have no bluish magnetism marks so i really dont know what it is!
thanks
will.

if its pale yellow, it sounds like the video cable isnt plugged in all the way

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that would be the one to the video card right lol ive just upgraded my grafix card so it is in properly... hmm im sure it must be something to do with the tv..

nope not solved it definetly not that, im gunna leave it unplugged and dea-earth it tonight and see if its ok in the morning.
Cheers.