CD Changer not reading CDs

2000 bmw 528i,my cd changer also reads no cds,this seem to be a common problem with all bmw cd changer.Anyway i removed the cd changer from my car,took the outside black cover apart only to see that a white big wheel came of its place,(its the wheel that holds the cd in place from the top (bottom wheel is black attached directly to the motor,as the cd is sandwitched between the black,and white wheels) .if that wheel is out of place the cd will not turn inside the changer for the eye to read it,so your radio screen will read NO CD OR NO DISC.Very easy fix,just place the wheel in its place,and everything worked fine,it took me 20 minutes to fix.
p.s :
1- you do need to make sure you have an original cd in for testing it.
2- you do not need to recode your cd changer at the dealer if you have an old bmw,dealer will need to recode cd changers for 2006 and up.
Good luck.

See if the cd has cratches on it or not, and try to play it in other cd changer if it works then your cd changer must be checked by a technichian in cd changers