I have a Philips BDP5506 blu ray player, with firmware current, connected to a Sony STR-DH720 receiver. The receiver itself connects via HDMI to a projector. The blu ray is connected to the receiver via HDMI. The picture is fine, but there is no sound. When I go into the blu ray menu the HDMI audio output is greyed out. As a workaround, I connected a coax line from the blu ray to the receiver and modified the receiver input for the blu ray sound. If the HDMI cable is connected, I get picture but no sound. If I unplug the HDMI I get sound ( no picture, of course). I am at my wits end. Suggestions? Thanks.