OK my bose head unit was starting to go, so i bought one from an org member, now the problem is that I use a cd player that attaches to the headunit. There is a fuse in teh back of the head unit, I am not sure what it is for but on the other one, it is not there, there is a spot for it, but no fuse?? and I hooked it up and teh cd plays, but no sound.... ANY IDEAS???