Sounds like there is some interferece with the working parts. CD's can get stuck as well as the little plastic parts inside break..or just get jammed.

Many owners just replace their receiver and CD changer altogether when that happens. Some people like me have done everything to beat the crap out of the player. Whether beating the thing works depends of course on what is wrong. Some people have gone so far as to take apart the player to get to the problem's source.

My player was stuck for good until my mechanic pulled the changer out and while it was still wired, turned the player upside down and pressed the buttons. Whatever was wrong with it (and mine did make a horrible noise at start up) seemed to right itself when held upside down. I hit it a ton of times too.

Just do a search on "cd player" and you will find hundreds of posts complaining about them. Bless their plastic hearts...