My sister in law has a 2001 Renault Clio. For some reason when you put the key into the ignition and turn it the car will not start. It is trying to start but doesn't. Beside the spedometer there is a fast flashing LED between the words Stop and Serv. Usually this light will go out and the car will start but it hasn't done for the past few days. I was told that it may be a problem with the key. I put a new battery in the key but it didn't help. Does anyone know if the problem is most likely the key or could it be something else?