Just bought a Monoprice 1.4 downward compatible HDMI cable but it does not work with my A20. I put it on another device and it worked perfectly. Previously I used a circa 2006 Monster M1000N HD with no problems. The Monster would not stay connected so that is the reason for switch out. What is odd that I am now using a 'came in the box HDMI' that came with my new Panasonic Blu-Ray. It works just fine.