How can I fix my Sunroof?

Hi, I have a 1997(P) Ford Mondeo MkII, It is fitted with a tilt and slide sunroof which only tilts and doesn't slide, when trying to turn the handle to slide the sunroof it simply doesnt move and the greased cables that run around the sunroof start to pop out, it appears that the levers that control the glass itself are not properly in place but cannot see how they are supposed to sit and the sunroof doesnt appear sit in the recess as it should.
Please help I am on the verge on simply sealing the roof to the hole and leaving it,
many thanks