[garylewa]

Regarding the picture you posted:
Remove the transmission (gear), clutch (black rubber cylinder) & motor. There are two screws mounting the transmission and one screw mounting the sunroof motor bracket, also unclip the power feed to the motor.
You now will be able to slide the roof back and forth by hand on its tracks. Push it back far enough to remove the panel liner (three screws) and pull this out through the sunroof opening. I would then remove the deflector and both hinges (hinges are screwed down with one screw each; the deflector is held on with two circlip pins) I would then pull out the whole sunroof panel and take the tracks off too (three or four flathead screws on each track).
Clean everything off; it's probably really gunked up. two "shoes" (for lack of a better word) along with two metal spiral cables should come out with the panel. Let me now when you get this far and I will post the way to re-assemble.
These sunroofs are a major PITA (ask me how I know....) I actually modified the "shoes" for better movement and a better roof line fit when closed by removing the small rockers attached to them. The roof opens and closes much easier with these removed.
I think your issue could be one or more of the following if the motor is turning the clutch:
1.) the adjustment screw in the tranny is too loose; crank that thing down first
2.) the tranny gear is not making contact inside the spiral valleys of the cables
3.) the cables came off of the roof panel
4.) cables are not inserted into the corner track bores
5.) lack of lubrication on the cables and/or track
6.) the brass cable tubes are full of junk