RepRapDiscount Full Graphic controller - SD card issues
I'm attempting to install a RepRapDiscount Full Graphic smart controller on my Arduino Mega 2560/Ramps 1.4 setup. I'm using the advanced configuration for 0.92.9 firmware. I've gotten things to the point of where the menus show up, I can control motors, and such.
HOWEVER... I can't get the SD card to function.
First off, I need to understand something about the SD card menu - in the event an SD card is not inserted, will there be anything other than the "Back" menu item?
Here's what I'm seeing - when I insert an SD card (I've tried 3 different ones so far - 2 GB with FAT filesystem, 4 GB with FAT32, and a brand-new class 10 8 GB with FAT32) nothing happens. No message, no error. Going to the SD card menu yields only the "Back" menu item.
I've enabled the SD through configuration.h. I've tried a few things with the SD card detect settings. Honestly, I'm walking blind, though, and I don't know how I can tell if it is my fault or defective hardware.
I'm linking to my configuration.h and pins.h files just in case someone can check it out. I would very much appreciate any help.