I was playing around with 300D a day ago and when i wanted to play with it today, i realized the switch was in the "on" position, so naturally the battery is flat. But when I changed the battery with a fresh batt, it doesn't turn on. I recharged the flat batt and used it but still no results. Now what? I changed the CF card, i changed lenses, still nothing. Did i like shorted out the camera or something?