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Issue with Little Squares on iMac Display

I keep getting these colored squares on my 27" iMac Display (I do have a second display connected as well). Does anyone know how I can fix this issue?

https://imgur.com/a/8Bhla

OS X Mavericks (10.9.1)

Posted on Nov 11, 2017 7:30 PM

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Issue with Little Squares on iMac Display

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