Audi A6 Quattro won't move and changed front cv joints
 

I need help. I have a Quattro A6. While I was driving the car I heard a metal clinging/ snapping sound and then the car wouldn't move. I changed the front cv joints/ axels both sides and car still won't move. When you put it in drive the driveshaft spins but again still won't move. Any suggestions? I wasn't sure if there were cv joints in the rear also because if the diff was bad I wouldn't think the driveshaft would be spinning.......please help!!!!!