2000 Pontiac Sunfire Car Doesn't Crank/ Or click.

My son's vehicle is sitting now in my driveway and will not start. The diagnostics to date are: Upon Key in: Warning Bell chimes, but no dash lights, Idiot lights, or radio. Turning the Key, there is no crank, not even a clicking sound like the starter is trying. I shorted across the starter posts, and there is power, as the solenoid fires (but no crank). All fuses in ingnition and fuses box are good. I was thinking starter, at first, but with no power at dash now, I am wondering if it is in the key switch or ignition switch prior to sending power. My question is what is next step in diagnosis and where is the ignition switch located?