I am determined to fix this myself, because that should be cheaper and it seems a simple, easily accessed part to replace/check. I think the starter has failed, not the solenoid. Here is a youtube video I posted:
When you listen to the sounds, what do you think? Also, notice that my UG on the dashboard has reset and is scanning. Total power loss at some point? Battery is fine. The clicking is the solenoid, right? And that low whrrr at the beginning is the starter trying and failing to turn, yes? This problem suddenly appeared yesterday, and after a quick run to the store today, for which it started fine, it now fails.
I'm thinking I probably need a new starter.