When anything happens you don't know how, reset the camera back to factory defaults. Try again. If the condition remains try the next simplest step. A new SD card and/or reader. A new USB cable or slot in the computer. A new battery. You know the easiest and cheapest.
EB
EOS 1D, EOS 1D MK IIn, EOS 1D MK III, EOS 1Ds MK III, EOS 1D MK IV and EOS 1DX and many lenses.
