Hello, I'm hoping someone can help me with the problem I'm having. I was playing a gig last night and out of the sudden my Hartke vx3500 amp stoped working. It's got power but no sound at all. Now, I'm thinking hopefully it's just a fuse or something. Has anyone experienced anything like this? ALso, I pulled out the fuses and 1 of them just has a plain wire in the middle, the other fuse has like a little ball in the middle of the wire. Is that normal? or is it a blown fuse? I'm really hoping that's what is is. THank you.