Hello, Sorry you're having problems. Is there any chance the unit was shifted, or moved with discs inside of it causing it to jam?
Also, please unplug the changer (pull it's power cord from the wall) wait 10 seconds then plug it back in. turn it on and press and hold the Eject button for 10 seconds. Let me know if you can hear the eject motor trying to engage please.
Please try those steps first, if the issue goes beyond that then the next steps are to remove the screws on the sides and rear of the player, and then remove the top cover (unplug it from power first). Visually inspect to see if any discs are lodged or jammed inside of the player. Any shifted discs will cause the Eject motor to not be able to engage.
Beyond checking those things, this would indicate a hardware failure with the Eject motor which would require repairs. The average cost for this type of repair is in the $125 range unfortunately and if you'd like, you can use the link below to locate a shop in your area:
Other than that, I'm sorry for the bad news here and wish there were a quick fix.
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Do you need further assistance with this?