My m3 ds real card won\’t load any of the .nds files I\’ve added to it, despite the software being up to date.?

I’ve purchased an m3 ds real card recently, and I’ve uploaded the software sucessfully to it. However, when I go to play a game (which are on there, as it shows the title and the icon) it just refuses to continue, and goes nowhere. Also, when I click Slot-2, both screens go white and nothing happens. I don’t want this to be a waste of my money.