I've found HDCP is triggered (over HDMI/DVI)if the video DVD is copy protected. One way round this HDCP crap is to strip the copy protection off the DVD and make a new copy! BUT ....... why not just use a BX case computer (or a laptop with sound out_?! (BX cases are more portable).
The original problem was an LCD screen that seemed not to be HDCP compliant with a G91.
Works with a computer .............!!!!!