Bought my home in 2006 with family room theater install for TV above fireplace. Builder installed 6 RG6 cables running from TV location to lover corner of adjacent wall for "HD viewing" I asked them where is the HD capability and they said to just add RCA connectors on the ends of the coax and plug into the HDTV. I purchased the RCA connectors and plugged the coax into my HDTV - blue, Red, Green, and audio - red and white. PROBLEM: This setup works OK for Comcast HD cable boxes as they have multiple type output but does not work at all for Blue Ray Players that are HDMI out only. Any suggestions on how to get my BlueRay player to play / connect with my HDTV that is connected by coax RG6 cables through the walls, other than by just placing the player on the fireplace mantle and connecting a HDMI to it externally?