I was shooting a senior portrait sessions yesterday and with about four or five shots left to go, my 30D just shut down. I think I might been changing the ISO setting at the time. I quickly changed out batteries to some fully charged ones and still no luck. The small orange lamp below the big wheel on the back blinked on when i inserted the new batteries, but nothing showing up in the menu, in the display screen on top, etc. I'm hoping i accidently pressed a sleep or "coma" button, but not sure. Anyone experience something similar or hear about anything like this ... please help.