OK here are some pictures:
Picture 1. The arm here on the left side should move up and down slightly. if it doesn't then the gear is engaged and it is out of alignment.
Picture 2. The right side arm should move a little as well.
Picture 3. The insert mechanism should look like this when the disk is ejected.
Picture 4. The white pieces that hold the disk should move freely until it contacts the disk housing. if any of these are not like this then it is the deck alignment and you will need to take it all apart and start from scratch to get it back in place.It is a bit tedious but im sure you can get it after a few attempts.