sunroof problem
 

Hi, hopefully someone here knows someway to fix this.
I have a 99' Audi a4 1.8t. Everything is working pretty well on it with the exception of the sunroof. Today I opened it and now it won't close, I turn the switch and it makes a terrible sound like the motor to move the thing is turning and just grinding something, the thing definitely does not move a bit. Any thoughts/suggestions?