background of the amp: my friend had this amp in his 07 beamer. he had a complete jl setup. all amplified. and one day nothing worked. his cd player came on but no sound came out. so i got the amp from him. (i thought his cd player went out because the amps powered up) Thats all the history i know of it. and ive tried turning all the dials every which way possible. and nothing... i got another 500/1 from him ( was never installed) and it works. im stumped. one of the resisters looks a little worn but could that be the reason why? thanks in advance. Eddie Gossett