Francisco

Can someone please help

I’ve had my MB for several years and aprox 6 months ago I went to power it up for a gig and no sound was coming out. It lit up but didn’t produce sound. I kept fiddling with the on & off switch till it finally started working. Now I’m not getting anything out of it. The amp powers up but no sound I can hear the fan working. Sometimes when I shut it down I can hear the bass through the speaker. Not sure what the problem is.