New to forum. Thanks in advance for any feedback. I have a Denon AVR-590 set up to my Samsung tv using Directv service. Everything is run through the Denon receiver. Worked fine for three years. Then last night there was suddenly a loud "click" and the sound went out on the Denon receiver. I've checked all connections. Unplugged and replugged back in. When you try and adjust the volume (either with remote control or the knob on the receiver, it stops at "18db" and won't go any higher. Thoughts? Thank you in advance.