if it is Pokemon diamond or pearl you wait do not insert game card until you have selected the oppisit of your diamond pearl then u stick game card in and it will read it as diamond/pearl whatever is the oppisit of your game this happend to me andd i about threw it away lol
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Try taking the AR out and then putting in the game you want the cheats for. Then tap on the green *
If that doesn't work your AR is probably a dud. Exchange it for a new one at the store you got it from. i tried to add a new code but all the games got deleted and i cant add them back thnx for the answer
What I do is get a bit of dirt off then change the way you put the game in to diagonal. It works for me
Good Luck!