Any advice is much appreciated: Rotel RX-830 no output. Symptoms: 1) No light comes on; 2) Tested the power cord and the power switch, both work; 3) Tested the main capacitor, works; 4) Tested the power outlet, works with the power switch; 5) Can hear low humming when powered on; 6) When switches speak select (A, B), there is little cracking noise from speaker; 7) No sign of burning or loose connection.
What else should I check? Any help or advice is greatly appreciated. Thanks!