[misiozol]

Try determine if it's mechanical issue, like faulty mechanism/switch/microswitch/motor. you can try to supply power to motor from AA batteries in series starting from 1,2,3,4 and reversing polarity on motor. See if this have any effect and will open try or close.

Use multimeter and check if voltage coming to motor when eject is pressed, check try switches/microswitches for continuity on open close positions.