no fire,a bit lost....

I'm afraid you're going to have to put a meter on it if you want to find the problem without changing every component in hopes of accidentally finding the bad part. Start your testing with where you have juice and follow the circuit to where you don't. There will usually be a part or connector in the circuit that is faulty. A no-crank at the key can be many things.....ignition switch, neutral switch, bulkhead connector, starter relay, etc. No juice at the coil or module with the key in the "on" position, adds many other items to the list.