If it's not making any sound at all that would be my first guess. If it's making sounds my guess is you didn't tighten the clips on the bottom of the glass right and it's a bit cockeyed so it won't move. I had some issues when I replaced mine. Just bolt up and go didn't work perfectly. Had to have the back side upwards a bit in the clip to go all the way up. Only other guess is your connection came appart but I doubt that since there is a pinch tab on there and a lock clip.