g6 ds 8gb (1gb) black screen with Rune Factory

Hello All,I started playing Rune Factory...I get to the point where Mist asks me to follow her north across the bridge...I follow her and the screen goes black...I can hear the noises from the actions I am doing but I can only see a black screen.P.S. It works on my wifes M3 DS Simply with no problem.Please help ???

then get a M3