Yep, those Sony's have a big issue with their transport and how a certain microswitch related to the slide fails - causing it to continually try ejecting or not at all if a disc is inserted.
There is a fix "out there", and while I did do what the steps said to mine a year or so ago, it wasn't too long before it started to act up again. I figured I would take a 2nd look at it this weekend, and while at it (I'm "dangerous" now with more tools available lol) do a good thread on documenting the progress. Should be something starting Friday night, probably...