http://www.nintendo.com/consumer/downloads/DSi_English.pdf for the manual. Just in case you should want to follow what it says and look it up:) Did you do a recent update on it? Just asking because newer DSi firmware blocks out third-party devices like the Action Replay or flash carts. You have to check the Action Replay website to see if there's any firmware update for the AR to bypass. BTW are you using something like Acekard? http://www.dsihacker.com/acekard-2i.php So let us know how it is going and if you need further help. Give us all your info so that we can find a solution to this....Good Luck