New to using ROMs and have lots of questions

I'm new to using ROMs for my NDS and I'm downloading certain games and using gamemanager to get them onto my SD card, but when I attempt to play them, all theyre showing is a white screen.I'm thinking its because the files are corrupt or something? If anyone can help, I'd really really appreciate it.Thanks

What flashcart are you using? Updating your firmware should fix the problem. Also, did you extract them?

And did you put in your flashcart... Just kiddingThere is a game manager for ds ?? and maybe is that game manager you use that make the game cannot be play

Yes, that may be causing the problem.. Just normal drag and drop is good enough.. Unless you don't know how to drag and drop..