Hi there, Let's make it simple. I just installed windows 7 just because I hate 8.1 and 10 so much. On those systems I was abe to run 3 screens without any problems. Now, when I installed windows 7 only two screens work even though third is detected. There is " turn off screen " option enablen and when I want to change it, it doesn't want to save. Please help me because I can't install new system every week. Before you ask, I use Gigabyte 7950. Screens are connected through HDMI cable, minidisplay port to HDMI cable, and minidisplay port to HDMI adapter where I plug in HDMI cable. On 8.1 and 10 windows pc very often "ran into problem " and I had to restart computer. That's why I don't want to use this system.