After booting up the screen is a mass of small rectangular blocks which move up and down the monitor. I have a picture of it so it would be good if I could upload an image on here at some point.
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Could be a problem with the lcd screen or maybe a problem with the graphics card that is integrated with the motherboard. I would try to connect the imac to an external monitor if the image of the second monitor is ok u can reject a problem from the motherboard and look if it's a problem of the lcd screen
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