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????