Green screen on black areas of monitor

Hi,

After using an external monitor with my 2009 2.66GHz MBP for the 1st time in at least 2 years, the black (and some dark coloured areas) on my LCD started flickering bright green. I am not sure if one has anything to do with the other.

I pulled off the back cover and removed and cleaned the LCD connection, but the problem is still there. The monitor shows perfect on an external VGA so I don't think its the graphic card - however when I touch the bottom of the motherboard (metal guard near the battery) the issue goes away.

Does anybody have any idea what this issue could be?

Thanks for any help

Update

Update:

I replaced my monitor and the green lines in black issue disappeared only to be replaced by purple vertical lines all over the screen. They come and go at random.

Any ideas?

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