J.Y.
Some kids respond better to rewards than punishment (though I hate rewarding kids for what they should do). In the mental health area of the hospital I worked in, all privlidges were taken away- TV, video games, computer, games, everything- for a period of time, usually a week, until they could act right, then they could earn these things back. You may need the help of a therapist or psychiatrist. Definitely take care of it before he's a teen!