I'm in desperate need of help. My old amp is giving me some problems. Its an old Acoustic 200 w, 120volt (60 cycle) solid state head that powers a 2x15" cabinet. The problem is that I can turn it on and the little light comes on to indicate that power is being supplied, but no sound is created. The instrument cables are fine and the cabinet is fine. The only clue I have is that I get no feedback from touching the line in cord (the one that goes to the bass), which normally makes staticy noise if in contact with anything. What kind of diagnostics can i run with a multi-tester? My budget and the lack of any good electrical technician that specializes in this in this town are forcing me to do this on my own and so any help would be greatly apprciated. A thing to note would be that it was working great last friday and I got back home form being out of town last sunday and it began behaving like I described above. This would lead me to believe that its something simple. Also I checked the fuse and its fine. Once again any help would be greatly appreciated.