I dropped my smart key from a second-story window to the grass and the next thing you know was that my car didn't recognize the key anymore and the engine wouldnt start. The red light on the keyfob was blinking and the doors were opening and locking. Then i replaced the batteries and and the key wouldnt even blink any more. So i dragged my MB '97 C220 to the electrician and he claimed that the key was dead, electronic ignition switch was stuck and the ECU was dead also (all 3 needed replacement). So how can a key fall cause the EIS and ECU to fail? I have done all the research, but found no help... Any ideas or suggestions???