My SC5000’s and X1800 are just over 3 months old. They are set up in my Studio, and aren’t moved gigged etc. On the odd spare hour they get fired up for a mix, and that’s been very rare since owning them. At a guess; i would say they have had less than 10 hours use. Today I had said free hour, and went to have a play but one unit (SC5000) doesn’t switch on; nothing. I have tried using different power sockets, and used the lead from the unit that does power up, and still nothing. Is there anything trouble shooting wise I can do? Is this common with these units?