My little Nikon P&S will not take a picture. Wife had it out last weekend & took a few shots in the rain of dogs dock jumping, came home & took a couple more shots in the house. After that it would not take a picture. Thinking moisture was the cause I took out the batteries & card leaving the camera to dry. It is now four days later & it will focus (as it did when it stopped working) but will not take a pic when the button is completely depressed. Fresh batteries & empty card make no difference. Any ideas?