There are lots of ways to configure that shield. How have you configured it (solder bridges)? Have you connected the ICSP header? Can you make a photo of your finished shield on place on the Mega and post it here?
There are lots of ways to configure that shield. How have you configured it (solder bridges)? Have you connected the ICSP header? Can you make a photo of your finished shield on place on the Mega and post it here?