The posts you see on this site have each been written by one of more than 90,000 different people who had car problems. Most of those people do not visit this site again to look at other people's posts; they just came here to see if someone could help them with their own problem. So Kelly, or Jim, or 99% of the other people who signed their name to a post will never see your message.
The people who usually see your post here are the mechanics, enthusiasts, and compulsive car addicts who get off on helping other people, and thus visit this site regularly. We are the ones who have enough knowledge and experience to
be able to help you; not the casual person who wrote in once with a car
problem. I don't understand why this is so commonly misunderstood.
Regardless of whether Kelly ever found this out; there is absolutely no way that a timing belt problem can affect a catalytic converter. Furthermore; there is almost no way that a bad catalytic converter will prevent a car from starting. Anyone who tells you that you need a new catalytic converter in order to fix your starting problem is either high on drugs, or is completely ignorant about how cars work, or is trying to rip you off by flat out lying to you.
The usual reason a car suddenly does not start is that the battery went dead, from one of several possible reasons; or if the starter runs but the motor does not fire, it is usually the camshaft position sensor or the crankshaft position sensor. But not all cars have the same parts on them; and some cars are known to have certain common problems. So in order for us to help you effectively; we need to know the year and model of your car, how many miles it has on it, and the engine model or at least the number of cylinders it has. If you want some real help here; please click the "answer this question" button below this response, and enter the requested information in the box that appears. Then click the "submit answer" button. We'll get back to you in this same thread.