There is a board inside the drive that has 2 switches on it. If you push down on one of those switches (most inside one i think) then hit eject the slides should move and the laser will lower (eject disk) if this does not happen then that board with the switches is probably bad. You will nee to remove the single screw holding down the roller arm assembly and take it off to get to the switches.
Be sure to install the arm assembly with the drive in the (no disk) correct position or it will make a horrible noise. If you need pics I can post some or a video when I have a minute.