Suggested troubleshooting procedure: 1.- Go to settings > Check your firmware version. 2.- If 4.1 or higher your flashcard could be not compatible (R4s, etc) 3.- Check with an original game 4.- If still not recognized open your DS 5.- Look for continuty in the Slot-1 pins and as well in the swtich that check if the game is inside (are the two contacts solder aside of the slot-1) 6.- If not having continuty or a bended pin your solution will be to desolder the slot-1 and replace with a new one. Manuel / Montreal Console Fix Parts