Car stereo. I have a Ford Mondeo (2005) Ghia X with a sony 6 cd autochanger system, the problem is

Question

I have a Ford Mondeo (2005) Ghia X with a sony 6 cd autochanger system, the problem is that i cant eject any of the cd's, when i press the load button the readout says 'all cds full' but when i press eject button it says 'no cd'Any help would be welcome as i'm getting a bit fed up with listening to the same 6 cd's for the last 4 mths