My system has always worked fine until today when it stopped working. It stopped working when i got a little happy today and turned it up too high. I've tested the sub on another amp and it works. On the amp, all the fuses are fine and the lights turn on just like it used to, but when i hook it up to a working sub, it doesn't work. I've open the amp case backing to see if there was anything burnt; there wasn't. What is wrong with my amp? [IX402 Kicker Amp]