Try connecting a test light to the ignition coil's negative (ground) side. Have someone start the car. While the starter is turning the engine, the test light should blink off and on. If the light stays on then something is wrong with the ignition circuit that signals the ignition coil to fire. If the light does not light at all, then you have no ignition voltage. If the light blinks off and on, then the ignition primary circuit is probably OK.
Here is an article about ignition circuits:
http://www.familycar.com/Classroom/ignition.htm 
