Camera lens

This can be caused by several different situations.

Most commonly the camera has experienced some kind of impact which knocks an element out of alignment, preventing the lens from rotating normally. Symptoms of this include:
*you may hear no mechanical sound at all when the camera is turned on
*you may see visibly mis-aligned components of the lens
*you may hear a loud "snap snap" sound as the camera tries to move the lens when the camera is powered on

The second most common cause is a particle of sand getting stuck in the focus motor drive gears. This prevents the focus element from moving normally and causes the camera to shut off to prevent damage to the lens assembly. Symptoms of this include:
*A loud "buzzing" sound when the camera is turned on, followed by the beeping and shutdown.

Finally the third most common cause of this problem is a broken tooth on the zoom motor drive gears. Symptoms of this include:
*the sound of the running motor with a regular "click click click" sound for several seconds. This will not be a "snap snap" sound, that is a different problem.
*the lens will move in and out easily by hand as if free from any resistance.

All of these problems require disassembly to repair. The charge is around $125 labor at my shop.