Disc tray does not come out

Question

I have Onkyo - DR-C500 model. THis playey is 5 DVD/CD changer. There were five disc inside when I carried thatto other house. There when I tried playing I see disc tray where I load the DVDs never comes out. I opened up the reciever and removed 4 disc. I dont remember if there is one disc in the receiver which seems to be stuck inside. As I see front panel only reports disc 2 always and plays when I press play button. No voice come out from there and it looks like some thing is improper inside. Can some one help me to fix this as warranty is over.Harshad