Does anyone have any suggestions how to fix the 6-disc cd changer? The cartridge when pushed down will not be accepted by the player. I don't hear any mechanical noises to indicate that the motors are working but a red light does show up when the eject button is pressed so it seems like there is power.

It ejected perfectly a few days ago then I left the cartridge out over night and when i tried to insert it (empty) back into the player it kept popping up.