My son shut off his DS when the Action Replay kit says not to. Is there a way that it can be fixed? When he turns it on, the game won't launch. Thank you.

It is very possible that the action replay broke. Try inserting just the game without the action replay and see if it turns on, if it doesn't, the game is broken.

Please look at the dates of the posts BEFORE you respond to them. This one was over 2.5 years old as were most of the other threads you have answered.