Hi Welcome to just answer.
I would like to know more about the question:-
1. What happens when you try to play or rewind? Do you hear the tape moving?
2. Have you tried to completed remove the power and disconnect battery of the system, wait for 30 Min and then try again?
3. What does the screen show?
I would like to know if you can hear anything when you press eject
Ok it looks like the tape is stuck and the only way to get it out it to probably take the system apart to remove the tape. You might loose the tape as the loading mechanism might be defective
You will need to remove the top cover by removing screws that are holding the top. The deck will look similar to what is on the video below
Pay attention to the load mechanism gear that is white on this video about loading and loading process
If the mechanism is not rotating similar to the one on the video, then you might see some pieces inside.
Put power on and then press eject and see what is moving similar to the video. The mechanism should rotate and move the tape up and forward towards you.
Then a gear or belt might be the problem
It looks like a micro switch not working on the left side. The mechanism is trying to trigger a switch which is not responding. Would you be able to identify switches that are used during the system operation to stop or eject? You can use a screw driver to trigger them to eject the tape.