HDMI Audio Issues,

i got my Boxee, i connect it to my Samsung LED TV it works great.

i decided to put in the basement on my projection System
i have a Yamaha Amplifier where my xbox360 and apple tv, Dishnetwork Receiver all HDMI are connected.
so i connected the boxee to that AMP, i can see video but no audio.
i took back the boxee to my samsung tv, audio and video work over HDMI

when i plug it in my Yamaha no audio only video.

Any IDEA? i think it has HDMI compability issue the boxee box

Thanks.