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Helpful answers
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May 12, 2016 7:46 AM in response to toonickby lllaass,Some 2013 Mac Pros have a hardware problem
mac pro late 2013 freezes with spinning wheel
http://9to5mac.com/2016/02/06/apple-mac-pro-repair-program-graphics-video/
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May 12, 2016 9:42 AM in response to toonickby Grant Bennet-Alder,There is a legitimate blink that occurs when a display is added or removed.
If yours is incorrectly detecting a display addition or removal, that could explain (but not justify) the blink.