Today I was doing some tuning and pulled my sub out to get to my amp and was setting the gains on the front channels and went back up front to listen. I put some music on and everything sounded terrible and the amp shut off and then I realized that I had forgot about my sub wires. They were touching and caused the amp to turn off. Now my sub channel does not work. My amp is a zapco I-5100 I pulled the cover off and looked at it and could find nothing wrong and I couldn't smell anything like something had burnt. What would be the most likely problem. I just got this amp a few weeks ago and am quite mad at myself and am not sure exactly what to look for.