Epson 5350 EN - Manual (Page 159)

Problems with the Image or Sound 151
◗ There is no sound.
First check that the volume setting is not turned all the way down and
that the audio/video cable is securely attached to both the projector
and the audio source. Also, make sure that the A/V Mute button is not
enabled.
The wrong source is selected. Press the Computer button on the
control panel to select the proper source.