Recent content by shuning

Hi everyone, I have a desktop with windows 8.1 My graphics card is radeon hd 5700. I always ran 2 monitors with this computer, but recently I got a 3rd one. I tried plugging 2 DVI and 1 HDMI onto my graphics card but only 2 of them have display. When i try to extend my display to the 3rd mointor...