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Monitors flickering and “Input Signal Out of Range"
Hello! I have a Mac Mini (late 2012) 2.3 GHz Intel core i7 running up-to-date El Capitan, with two HP 2071d monitors. These monitors have DVI connections. One is connected with Mini DisplayPort to DVI Adapter, and the other with HDMI to DVI Adapter (that came with the Mac Mini). All has been...