I recently fixed the airbag in my clio, but when i reconnected the battery and typed in the code 3479 (which i have used in the past and is wrote down on a piece of card) the radio will not start up again, it makes an unpleasant bleep but no music comes out. In the past i have had the radio out and re entered the code and the radio started, what could be wrong with it. I don't want to change to an aftermarket radio because i like how the stalk controls and dash display work.