My laptop has green pixels where black pixels should be, so in other words when the Windows XP splash screen comes up during bootup the screen is completely green except for the logo of course. Every “true black” pixel is green colored and the problem is there when Windows is running too. I can see they are not dead pixels because all the pixels do it when a black pixel should be there.Ideas gratefully received.

Have you got an external monitor that you can try?

Maybe your laptop video data cable is damaged... It can be replaced... this happens naturally in the open/close movement.