Power "On" - but no Crank

[Zilverado]

Hey Folks.

So it feels like absolutely FOREVER since I've posted - I've nosed around at times, but have just been a bit pre-occupied. It's great to see that this place is still hopping, despite the INSANE fuel prices.

So, for the past week, the Chevy's been our daily driver as I dealt with "no-crank" issues on our Pathfinder. The very day I got the Pathy running, a similar problem comes up with the Chevy - now it's dead on the driveway (thank goodness it waited as long as it did).

The problem...

Absolutely nothing when I turn the key to the "start" position. Full power to all accessories, headlights, etc., just nothing to the starter - not even a relay click. This is the case both in Park and in Neutral.

No blown fuses (at least not in the cabin panel), and battery and terminal connections are spotless.

So, is there a relay somewhere I should be checking? Anything else?

Thanks so much.