Denon Stereo Receiver Why Can I Not Get Sound From My House Stereo Speakers?

Why can i not get sound from my house stereo speakers? - denon stereo receiver

I have a Denon stereo system via the Xbox TV, was so connected. But now there is no sound from the speakers, the device is switched on and I switch between functions, but no radio or xbox in everything that I have all the son of pregnant and she checked seem to be pretty sure that I am now, what his could help please