you are not very clear..if you mean your car is completely dead and not starting or showing any signs of life, it could be that your ecu (the brain and command center of your car..or the 'computer' as people say)is gone..either way, don't spend any more money towing it around and changing random parts..tow straight to nissan and all you will ask them to do is to only tell you what is wrong..if its the computer, let nissan do it for you; anything else, do it outside..best of luck