I got it from a pawn shop about 9 years ago and I never had any problems with it. Then over the last couple of months the sound slowly started going. I had to keep turning it up higher and higher to get the same sound as before. Now there is no sound at all. It's getting power but that's it. I opened it up and saw nothing out of the ordinary. Ideas? I'm not really in a position to buy a new one at this point.