I've used your PM 4.1's for about a year. Today, I have neither sound nor red/green lights. I checked power cable, plugged it in in another checked outlet, nothing. I unplugged the preamp cable, pins ok, plugged it back in, no change. I checked the speaker connections, both ends, jiggled wire, no change. I'm really hurting for these to be up and running...need to finish some recording and would appreciate some ideas.