Hello! I am very new to this kind of stuff, and this receiver has issues with outputting audio to my speakers. I had connected my center, front left and right speakers, sub, and rear left and right speakers, alongside my optical cable. The HDMI switch on the receiver works, but I get no audio. I know these speakers work as they work on my previous Yamaha receiver. What other info would you guys need\/what might I also be doing wrong here?