megane won't start

i have a renault megane 1.4 Extreme 3dr (02 - 05) 03 plate. it started up ok, but now won't start at all now, how do i repair this ?



when i put the key card in to start the car, the starter motor just clicks & won't start up, i already checked the starter motor & it's fine, the battery is new & fully charged, spark plugs are new.



on the dashboard, it comes up with steering not locked