Hey Cryingmeteor33,
I'm not familiar with the issue. Maybe just disable your monitor for the time being. Ill look to see if its a issue with Unreal Engine 4.
I had this problem as well. I would try to load the game in fullscreen (on my second monitor,) and the monitor would go black. It didn't turn off, though, it just stopped receiving input. Turning the affected monitor off/on fixed it.
It hasn't happened in the past two days or so, so I thought you patched it out. Maybe I was just overworking my GPU with something else at the time.