Now I did my fair bit of testing. Here are the findings. Now I used only three devices AVR, TV and D2H Box. Disconnected rest like projector and PC. After connecting D2H HDMI cable(stock cable with set-topbox) to all HDMI inputs I found out that only one is not working the BluRay one. Rest all were working. I took shorter Amazon Basics HDMI cable. Now when I tried with my MacBook to one of inputs. It came for a while and then displays goes off. Could it be due to Amazon basic cable not compatible with AVR. The same cable works fine with my LG Ultragear 24GL600 monitor. This seems wierd. Now I have again connected back all the systems together with long cable and all DVD input is back working again. Not sure what went wrong that day. But certainly the BluRay Input HDMI is damaged. I have used long cable it may happen that signal can go lost but can it damage the port as well ? Long cable can cause signal loss but shouldn't cause damage atleast that's what I reckon. Advise if otherwise.