Some recievers have a monitor button on them. if it gets pushed your sound wont work. look at the display and see if you see the work monitor. if so you should have a monitor button either on the reciever or the remote. it is a toggle button so just push it till it goes away and sound comes back on. make sure to turn sound back down before pushing this button as you might have turned the volume way up trying to hear it. my wife accidentally pushed it last week and she thougt is was broken untill i got home and simply pushed the button.
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