so after cleaning out our practice space, me and my friend found a yamaha power amp that doesn't power on. Our hope is to fix it and sell if for a few hundred bucks, and i'm looking for advice as to what the problem may be. My first thought is that a fuse blew. I opened it up and there are three fuses, two of them look brand new, the other has some kind of coating on it and you can't see the inside. Does the lack of power suggest a broken fuse?