Helped my son hook up a cheap A/V receiver (Sony STRDG510). Although I've hooked up many times with component cables this was my first foray in HDMI. We have run the HD cable box and the DVD player via HDMI to the receiver and then one HDMI cable from the receiver HDMI out to the plasma TV. Also have a Squeezebox connected via analog cables. The Squeezebox plays through the receiver and the 5.1 speakers fine, but the cable box and DVD can only be heard from the TV speakers - nothing from the receiver and 5.1. I've double-checked all of the usual setup settings. There is a rather cryptic note in the user manual that seems to imply that if you use HDMI all-around like we have that we will also have to connect the cable and DVD by digital coax or optical in order to hear 5.1. Is this the way it is for most HDMI receivers these days or did we just go in too cheap? Thanks.