Alright so after I updated to Windows 10 from 7 my second monitor no longer works, I have both monitors hooked up via hdmi cables to my crossfire Radeon 6800s. I tried updating the drivers which seemed to solve the issue for most people but after updating to 15.7.1 there was no change, and I still couldn't get it to work. So I decided to try the beta drivers, and low and behold while they were installing my second monitor came to life and mirrored my desktop so I figured problem solved. However after the installation was finished my second monitor went black and no longer works again. Its the weirdest thing, at some point along the installation process it works but then it stops again.