My Moultrie gamespy 200 camera works fine with the internal memory. I decided to try the SD card and it will not take pictures. It does record the number of events. When I do the diagnostic test it indicates code 000400 - Cam mod Failed. Does anyone know what is wrong?

I bet you haven't formatted the SD card. I don't have a Moultrie but my experience is that the memory card, no matter what type, needs to be formatted before it will record an image.