No sound comes out

Check the connections for all devices. link

Insert connection cables all the way in.

Check that input connectors and output connectors are not reversely connected.

Check cables for damage.

Check that a proper input source is selected. link

Adjust the volume. link

Make sure volume is not muted. link

If the status LED lights up in red, an audio signal that is not supported by this unit is input. link
In that case, set the audio format to “PCM” on the audio output device.