Put in a CD and noticed it would not play. Then, it would not open, either, so I could get the disk out. I tried several times. Finally opened manually the panel at the bottom in the hopes of pulling the CD out with my fingers. Could not do this as it was too far back in the machine. This is the sort of player that takes a number of disks at a time and plays them serially. It's an RCA MP3 5 disk changer. I could find no instructions for troubleshooting. Can anyone help?