Mac Mini Flickering screen


tiger-kai

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I have a mac mini 2011 running 10.11.6. I have it plugged in to a 32" Inves TV via thunderbolt to VGA. Its all been working fine and now suddenly the image is flickering and distorting whilst I work. Its hard to explain. It seems to do it whenever the mac is doing something. A program loading, or moving graphics in illustrator and every time I make a key press typing this. Does anybody know what this is and if it's possible to fix? Any urgent help would be appreciated as I work freelance and have a huge design job on at the moment


I have noticed when I reduce the underscan in display settings it stops a bit, but I have to reduce it a lot to do it.



Thanks!
 
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