I just bought a 4GB SD SanDisk memory card and I cant get my 700WX to recognize it. It fits perfect, says its compatible with the 70WX, and its a real SanDisk(not a SanDisk immitation.) I'm not sure if there's more to it than this, but I just inserted the card into the slot, and the 700WX makes a sound as if it recognizes a card. But when I check the card storage in the memory category, it says "memory not installed." What do I do?