switched on, nothing, no lights, no sound, checked mains lead, checked plug sockets, zilch. ive had it two years, bought used so doubt its under warranty. have gigged it every week, plus practise, been brilliant until now. ive opened it up to have a look, not that i know much but found the little fuse, i tested that for continuity and thats working so im not sure what to do now. I dont know if these things are repairable by amp techs or whether roland/boss will repair them.