Mine too, I've tried all the quick fixes including:
- tapping firmly with a blunt object (screwdriver handle) while repeatedly pressing the eject button
- sliding an old credit card underneath and tilting the cartridge up while repeatedly pressing the eject button
- holding the eject button for 10 seconds+
- disconnecting the car battery for 20+ minutes to reset the system
Nothing has worked for me and I've tried damn hard but my next step is to remove it from the centre console, take apart the player, move some cogs and lubricate the mechanisms. If there are any other ideas I'd be glad to hear em!