Camera will only switch on and then makes a buzzing noise

The problem seems to lie with the focusing mechanisms. Mine has a similar problem, but it is possible to turn it on - try tapping the back of the camera firmly but gently onto your hand, or just knocking the rear of the camera at different angles.This allows you to turn the camera on. However, the lens still won't focus, (I'm unable to take pictures at all), and you'll need to knock it again a few times every time you turn it on.