I have a problem with my 1D mark3, it refuses to format the CF cards and comes up with the message "cannot format change card 1" I am also have a lot of trouble downloading and editing the photos. I have tried multiple CF cards with the same result. I have checked to see if the pins that go into the card when mounted in the camera are OK but there is no damage and the cards mount smoothly and with no problems. I have downloaded the latest firmware and that has loaded nicely without any hassles. Aside from having the camera service, do anyone have any suggestions.