Imac cloudy screen condensation issue

When I switched my imac back on after Christmas I got some strange pixellation effect in the lower right hand corner. It looked cloudy and the resolution was poor. I was worried that my screen had suddenly taken ill so I rebooted into the Apple hardware test. When the computer was off I got a better view of said cloudyness. It looked like fogging underneath the screen, similar to what you get when you breathe on a cold window. See the lower right of the screen in the photo below.  read more »

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