If there is a grinding noise upon start up, or while playing with the zoom function, there's a high chance that the Hex screws are misplaced.

Double check the screws on the Front Facing Cover around the Lens Barrel are SHORT! (Will have to take off the Glass Lens housing in order to get to said screws.)

Long screws belong in the bottom of the covers, near the feet on both sides, and the rest of the Back Facing Cover