Ok, so I'm having band practice night before a big party gig, and we get through one song, and my amp just stops making noise. After about 20 minutes we're positive it's my amp. So we call down the guitar player's dad to check it out, speakers not ripped, everything is connected, everything seems ok. I run the preamp out straight to the PA and it works, but nothing comes out of my amp anytime for the rest of the night. We thought the wire connecting the speaker to the preamp part of the combo got messed up, so we go and get a high quality one to replace it. Replace it, two minutes later, it does it again. Exactly one year after I bought it. Any idea on what the crap happened?