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I have this really odd problem with my Mainboard. I have two LCD Screens (iiyama ProLite E2607WS). When both are connected to HDMI, some times one or both screens turn black for a second or two, then turn on again. This also seems to happen running Windows, or even in the grub screen. I'll try switching out the HDMI cables next. Anyone have any idea what this could be? CPU is Core i7 i6700K.