Problem of the Day: No Start. WTF?

[StephenVA]

Starting point for Diagnostics
If there is nothing when the key is inverted and turned, then it should be in the Ignition switch it self. Try moving the tilt wheel up and down and see if it allows the vehicle to start. If no, then replace the switch.
If however, the dash lights up, and the vehicle just does not engage the starter then look downstream from the ignition switch to the relays and the starter itself.

It it just a question of where is the break in the circuit. When the key is turned, primary voltage moves to everything waiting on the starter to engage, (Injectors, sensors, coil packs, etc). If you do not hear the injectors, and all the clicks under the hood, then double check the ignition relay that it indeed is functional and it is not the culprit. Common issue