When we merged households we ended up with two Pioneer 6-CD cartridge changers. They have both sat unused for several years. We recently got a tuner and plugged one at a time in hoping to use these on the auxiliary setting of the tuner. We didn't even get that far. Neither of them will recognize ANY CDs! It doesn't matter if the magazine is full, or one in any of the slots, CD right side up or upside down. Both of the units go to each CD, check it and then move on to the next one. Originally I just thought one of them was just beyond repair, but with both of them doing the exact same thing, I wonder - can this be resolved? Thanks for any insight!