I can't begin to guess. We do know that some of the video drivers Microsoft picks for us are just broken like that.
This is the situation. I recently got a spare HDMI adapter, and with another cable and a spare monitor lying around, I figured, "Why the hell not?" So, I plug in the adapter that's connected to my first monitor with no issues. However, when I plug in number two, both screens show the prompt saying that there's no signal. So, I get the idea to try it after restarting, and it worked. At first. When I plugged both cables into the adapter and flipped the switch, the startup loading screen for the computer showed up on both monitors, which is great. But that's where it stops. After the loading screen, both monitors go black, and not even the "No Signal" kind like earlier. I'm just wondering what the hell kind of prejudice my computer has against a second monitor. Any advice on this matter would be wonderful, so I thank anybody who gives advice.