I have just received a gameduino 3. When I try the selftest program it hangs in the storage test If I remove the SD card it continues to the SDCard test and shows the message "Error Cannot open file: selftest.gd2" that seems coherent. I have tried with several SD cards and no one seems to work.
Yes, the files are inside the SD. The issue seems related with the SD card itself. Finally, I found other SD that works, after testing several ones. I haven't found which is the different characteristics of the SD (speed, capacity...) that makes Gameduino work ok.