I have a Big Horn 3570RS. There a 3 slides. One in the bedroom which works off 1 switch. Two in the rear which work off 1 switch. They worked 3 days ago and today none of the slides worked. I was on external power from a 120 line. I checked the circuit breaker and fuse. They where ok. I heard no sound at all when I pressed the switch controls. Looking for ideas as to what may be wrong. Thanks