NAD C320 2-Channel Amplifier "cd players balance control plays" Questions

...won't go up or down). The bass, treble, and balance knobs also have no effect on the sound.     The lights are on, but no one's home. What do I do? lower the volume of the cd ...

...CD player or radio input. Then see if the amplifier plays OK thru the speakers on both channels and the balance control works fine....If it doesnt then the fault is inside the SUV-460 but if it all ...