So I was going to play Fortnite and I wanted to try a new resolution, so I changed to 1600x900. When I alt tabbed my screen just went black and my monitor froze (with this I mean that I could not turn it of in its buttons and only powering it of from the electricity). I tried in other games and this happens in all games. My native monitor resolution is 1920x1080 and everything works fine in that. I have a 2 year old GTX 1050 and a 6 year old asus Monitor. I have already tried reverting graphics card drivers but I got the same problem. What could be causing this?