one channel dead as a door nail

Put on my rig like I always do. First I fire up my Bel Canto SEP1. Takes 20 seconds than I put on my Bel Canto SET40 amp. Since my tuner is always on the sound comes on in a few seconds. Everything is cool until I turn on my cdp. A not too loud crackle/pop. No sound out of one channel now, whether it be tuner or cdp. Help