My receiver needs to be on in order to transmit audio through it as well as video. I can be completely wrong here, But I would imagine %99 of AVR's would have to have power to generate sound.
You may need to do some switching in your programming to the different HDMI inputs to be able to receive the signal from whatever appliance(DVD,cable,?) you're using.
I have a samsung 42" LCD LN46A750 w/ hd T.V. i ONLY HAVE 2 HDMI JACKS AND ONE IS USED BY MY CABLE RECIVER. I WANT TO CONNECT A HDMI SWICHER AND ONE OF THEM IS GOING TO BE A AUDIO RECIVER BUT HERE IS WERE THE KICK BACK START.DOSE THE AUDIO RECIVER NEED TO STAY ON TO SEND A SINGAL FOR THE AUDIO RECIVER TO WORK . THE OTHERS HDMI WILLN'T WORK CAUSE OF THE AUDIO RECIVER IS SENDING A SINGAL . PLEASE HELP ????