My Ampeg Micro VR bass amp, complete w/ its original cabinet, was brand new when I tried to get rid of the noisy cooler. I simply removed the cooler from the circuit by disconnecting its mini switch. But, as I turned the amp on, I heard a loud pop, and that was all, no more sound came from it. I tested the cabinet on a different amp head and it sounded perfect, no damage. I also tested the "Phones" output, located at Micro VR's front panel, and it was also working fine. But no sound from the SPKRS output at the rear panel. I tried to put the cooler back hoping that it would help but it just didn't. What could have happened? Thanks in advance for any help. .