Looks like I fixed it actually. It was a problem with the physical mechanisms of the drive. The arm along the left hand side was pushed too far forward, and also the metal "V" shaped arm along the bottom had a peg that kept sliding out when trying to push it forward. I took it off, gave it a slight bend so that it would make better contact with the socket in the arm, and pushed the arm back into place. Works like a charm now. Laser seems fine.
Thanks for the input!