This symptom is often a sign the player is nearing its end of useful
life. But, sometimes it is merely due to a collection of dust, dirt or
a foreign object lodged in the mechanism. Sometimes it is a logic
error inside the electronic memories.
So, there are a number of possibilities.
Here is what I would do:
ONE: Do NOT force it or use tools to pull the disc out.
TWO: If you can find the wires that supply the 12 volts to the unit,
pull that wire so there is no power to the unit whatsoever for at least
30 seconds. That will reset the electronics inside the player.
THREE: IF you cannot find the wires, or if they are too hard to get to,
you can pull the plus cable off the battery; raise the hood and with a
wrench loosen the bolt holding the plus cable onto the battery
terminal. Pull it off for at least 30 seconds or longer, then put it
back on. This will perform a hard reset as in TWO.
FOUR: If still no removal try this technique:
If it is not an expensive unit you may find it a superior investment to
purchase a new player rather than pay a tech to repair it. (In the
worst case the unit must be pulled, cover removed and disc manually
removed; then you may find out there are damages or defective circuits
awaiting further repairs; probably looking at a charge of $75 or more
if you go to a service shop).
Let's hope the ideas above kick it out and it returns to normal useage.