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there are very tricky mechanical devices that detect when the trays are closed and in what position they are in
A gear or mechanical piece is not in correct order or not functioning properly and will need intense studying to determine which position they all should be in at door closed , laser mech. position , standby position
can you upload a photo of the inside of the cd mechanism?
Most DVD players come with an emergency eject option. First turn the player of for a while and then try ejecting again. If it still doesn't eject press and hold the eject button for 5-10 seconds. This will force the eject motor for about 5 seconds. If everything fails your Player's CD tray assembly (could be a faulty motor or the plastic support on which the tray slides is worn out). You will need to get the tray assembly replaced.
This is an indication that the optics are either dirty or failing. Carefully open up the unit and clean the lens using a cotton swab and alcohol. That should resolve the problem. If not, try playing a music CD. If the CD plays but a DVD does not, the optics are failing and need to be replaced.