I use two displays, one with DP and one with HDMI. I recently tried switching my second monitor to DP because I will need the one HDMI output on my GPU for something else, but the monitor will not pickup windows output. I tried different cables and the different ports on the GPU to no avail. What's funny is I know it works, because when I dual boot into my linux partition, it will work for a few seconds when booting down (the 'shutting down' screen will appear on both monitors). When cold booting, the bios screen will also show up on on the second monitor but then go into power saving mode before going into windows. What could be the issue?