The non-functioning of the camera can be a fault/jamming in the shutter, zoom or auto focus sections and may be due to the mechanical failure of the drive. A simple was is to reset and we can try by removing the battery and card for some time. Now replace only the battery and while switching power ON, tap the lens hood on the palm of your hands so as to disengage any dirt or mechanism being struck. You can spray a degreasing spray on the lens hood sides and also assist the lens as it tries to come out, attempt to pull it out slowly while powering ON the camera. Also in some cases you can slid a thin film/paper on the lens hood sides to wipe out any dirt .
Tips to open and check for common faults:
http://www.youtube.com/watch?v=v2Mj3Qp3xYU&feature=related Use some air to blow between the lens to dislodge any sand particles struck inside. Unless you are familiar with handling of small devices must the camera be opened. If so check the voltage on the motor drive, check the auto focus and Zoom drives, it must be free with manual movement. If jammed the motor can be removed and released.
Since an estimate was taken and found to be high the only way out if you are equipped is to carefully overhaul the mechanism settings.
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