Just purchased a Dell P2715Q 27" Ultra HD 4K Monitor for my late 2013 edition Mac Pro (Yosemite OS). The Dell monitor is hooked up via mini display to display. I have it connected to the 1st Thunderbolt port on my Mac, and only have 1 more device connected via Thunderbolt in port 2. Every minute or so, there is a flash or flicker. Apparently, other users have experienced the same problem. Taking the advice offered in a forum, I purchased a new "gold plated" mini display to display port cable from "Cable Matters" and the problem persists. Any help would be appreciated.
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