i have a Orion Cobalc 800 watt amp hooked up to a 600 watt kenwood 10" sub and also hooked up to a 300 watt rocksford fosgate 10" sub and one day my amp just quit and won't turn back on. i checked all power connections and wires and there all good. i never beat on it but it has been cold. i opened it up and there is no burned smell or burned marks. is it broken????