I was out with my 7Dii all morning and on the way back to the car it went dead. It won't turn on, I have tried it with every battery in the house. They are not ALL dead. And a new SD card. Any ideas out there? It won't power up at all. It was working fine all morning, I was hiking with it for several hours and changed the battery late in the morning (it worked fine with the charged battery)
When you insert battery and close door, do you see the orange light go on? Also, try removing and reinsert ing your memory card, then do battery again. If that doesn't work try to find and clean the battery door microswitch.