Quote (bwuahaha @ Oct 6 2016 07:08pm)
what are the specs/models of your monitors? different refresh rates? try switching the cords around from the output of your gfx card and see if it still happens or if it then starts happening to the main monitor
DVI D for 60hz DVI I for 144hz if i remember what one goes for what correctly.
144hz monitor: Acer GN246HL
60hz monitor: Acer G246HL