Has anyone else experienced this? This week, our Canon Powershot A540 began taking very dark pictures, and then on Saturday, the view through the lens went completely dark. If the SD card contains a photo, it will display correctly on the LCD screen, but when in "camera" mode, there is no picture whatsoever. The screen is black, but the menu, and other display items will show up. Does this sound like the sensor is gone? Should that not be warranted? We got the camera last June, so it is less than one year old? Who do I contact? And How?