I'm a complete beginner with home theater. I just bough an ATV, Pioneer RX-V371 receiver and Polk RM 705 5.1 speaker system. I've connected the ATV to the #1 HDMI port on the Yamaha receiver, and the HDMI out from the receiver to the TV. The picture from the ATV displays on the TV (I can see the interface, menus, play videos, etc.) but there is no sound. I downloaded the manual for the receiver but cannot figure out how to get sound from the receiver/speakers with the ATV connected as it is. Please help!