The flashing input lights may suggest the protection circuit is being triggered, possibly by the silent channel drawing too much current due to an output stage fault.
Regards
Neil.
Edit: check if it still does it with the speakers disconnected.
the lights don’t blink now for some reason but i wonder if it’s a speaker since my right speaker works while plugged in to either the right or left channel output of the SN2
when you said protection circuit i thought “what could do that” and the first thing that came to mind is a short
sure enough, yesterday i moved some LP box sets around near the left speaker and the naca got a little caught up a bit but pushed it out and never thought about it again but it twisted enough to connect the exposed parts as i go direct wire through the post holes
anyway buddy, you saved me hundreds of dollars for nothing and weeks of music and I’m eternally grateful