cds stuck in the hu-803 - i have just replaced!!!!

[flanders7]

i am back ... again!

i have installed my new replacement (used) hu-803 following issues described above. i installed last week and it has been working perfect but my mate put another cd in and now it wont eject or play and cd error has come up. it is indefinitely trying to eject the cd but just not coming out and i got move through the disks either. i think a cd might have slipped or got stuck. can anyone help as i dont want to spend another