T41 noise on LCD when plugged into adapter

I have a T41 which works fine while running on the battery but when I plug it in I get intermittent noise on the LCD. It appears as if the display looses sync all over the screen whit the effect that vertical lines have lots of streaking towards the right. Sometimes when I put pressure on the left side of the palm-rest, the problem will go away but it is so intermittent. Also the problem will sometimes be quite slight and at other times can get very bad but as soon as I disconnect the power lead, the problem goes away.

http://support.apple.com/kb/TS2802

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