Green pixels on boot camp only

Hello
Since some time I have flickering green pixels in my dsiplay when I boot into Windows. In OSX the display is fine. Moreover is not a display issue as my mouse can cover the green pixels.
It seems the green pixels appear as soon as the EFI loads whatever legacy bios it uses to boot windows, so it does not seem to be a windows driver issue.
It is a 2007 iMac, Lion and Windos 7.
Anyone have an idea? Have there been other similar reports? I cant seem to find anything.
BR

Maybe the VRAM is involved, but I have run VRAM checks and it seems ok.

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              1          1         Pri GPT header
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