Follow the same steps as to clear the cache but instead clear the data. My camera has failed on me on two occasions and clearing the data worked each time. Hope this helps. Btw clearingthe cache did nothing for me.
I have had the same problem twice. Clear the data on the camera. You know how to clear the cache, clear the data as well. Worked like a charm for me. Hope this works for you. It is really frustrating not having your camera!