We just started having a problem with our Mazda MPV 2000 van. When we turn the key to start the car, it does not turn over and the emergency blinkers begin flashing. This continues for 30 seconds or so even after we have pulled the key out of the car and closed the door. Also, when we turn the key backwards in the ignition or unlock the door with the key we get a strange buzzing sound. Any ideas?