setting up a home theater comcast HDMI receiver problem?

plyio

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I'm currently setting up a home theater, and actually hit a road block. I know what I'm doing but am kind of looking for a rig around what I have and was looking for ideas. Ive got:
tv: HDMI, component
acer projector: HDMI - in Component - in (no audio out)

and I'm sending it through a Sony 5.1 receiver with 4 HDMI - in 1 HDMI - out and several RCA - in and no RCA - out

the weird thing is that my xbox360 (modded & unmodded), ps3, and laptop all can go HDMI in and out, but when I hook up my comcast box, the receiver gets sound WITHOUT the projector, but when the projector is connected all sound and video is lost. Only the comcast box is giving me this problem with an HDMI cord, everything else is working perfectly. I have plenty of cables and all connections work but this one. So any help would be appreciated.
Forgot to mention
DVR <-HDMI-> receiver <-HDMI-> tv
works, but the projector doesn't
 
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