One monitor using the HDMI port works perfectly fine
A second monitor using a Displayport to hdmi works perfectly fine, and seems to take priority, while booting. As soon as windows starts up however, the DP monitor goes black and can no longer be detected.
Both monitors using displayport causes both to black out and lose input as soon as windows starts.
Unplugging the second monitor completely and attempting a single displayport monitor also drops input when windows starts.
I've tried every combination of turning it off and on again (including the drivers). I've tried swapping the cables around (both monitors work fine with hdmi). I just want a second monitor.