I have a Rockford Fosgate Punch 500a amplifier. For some reason it wont turn on. I have a crossover connected to it that splices with its remote wire, so I know its not the remote wire. Also I have a power block that connect to the amp and the crossover, while the crossover is on. And I have the crossover and the amp both grounded to the same thing. Could the amp be blown? Is there a way to fix this?