So all of the sudden today my Pioneer 4100nex AM/FM radio will not function. I noticed that none of my presets were listed and there was not station showing, nor could I tune the radio. I have attached a pic for reference. I was thinking that maybe the antenna cable in the back came out, but was still confused a to why the presets wouldn't show, so I went to a local Best Buy and there was a 4200nex on display with no antenna plugged in and it still showed presets and a station number that could be tuned. Obviously it showed no data coming in, but the presets and station number were still on the screen. While it's not the exact same model, I have to believe the would both act the same in this manner. 

I did do a reset on the radio and that still did not work. EVERYTHING else works just fine, just not the AM/FM radio.

Any ideas what it could be?

Thank you. 

Any updates on this? This has happened to my AppRadio 4 on a couple of occasions, except the radio came eventually came back. I can't recall if it was after a restart or if I just changed sources and then came back to the radio.