check mo yung fuse ng main line ng amplifier yung malapit sa batter.. meron ka ba nung mga jumbo type na fuse with acrylic case?? try mo palitan yun minsan dun nag loose connection yan
if busted yung fuse sa may battery or loose yung connection di ba di na mag-power on yung amp? amp is powered on, so ok naman yung main fuse sa may battery, hindi pa siya blown, pero i'll check pa rin the connections just in case. thanks