I am having issues hooking up my Tritton AX720. I use an HDMI cable to hook up my xbox to my HDTV. Per the instructions I need to have both the HDMI cable hooked up to the TV and the HD Audio adapter hooked up to the decoder box via optical cable. The issue is that when both the HDMI cable and the HD audio adapter are plugged into the back of the machine my HDTV shows no signal when the console is turned on. Only when I remove the HD audio adapter from the console is when my HDTV reads the xbox via the HDMI cable. Has anyone had this issue?