I have a new P20 and when I plugged it in, I get an intermittent (quiet) hum and a clicking sound from the unit. These move in a cycle and continually repeat (in the same rhythm). I also get movement that corresponds to this cycle on the meters on the front display. I have plugged in other components, but have not turned them on until I get this straightened out. I have power cycled the unit several times.
Appreciate your thoughts in advance.