I have connected Windows laptop to HDMI 1 and Macbook to HDMI 2. When both these laptops are running everything works fine. When i disconnect HDMI 1 cable from Windows laptop, HDMI 2's screen goes blank for a short duration and again reappears. This behaviour continues forever until HDMI 1 is again connected. Someone please help me run Macbook on HDMI 2 when the other is disconnected.