Well, as we used to say in the Ozarks, "I'll be jiggered!". I created a new SD card, put it in and powered up, and nothing happened.
Then, I thought, "Well, perhaps there's a cold solder joint somewhere", so I grabbed either end of the RPI and gently twisted, thinking just that slight stress might reconnect a cold joint.
It actually started to boot! Crazy!
I'm going to keep this one for testing here at home - it might be a while before I trust this particular RPI to navigation on my boat.
Then, I thought, "Well, perhaps there's a cold solder joint somewhere", so I grabbed either end of the RPI and gently twisted, thinking just that slight stress might reconnect a cold joint.
It actually started to boot! Crazy!
I'm going to keep this one for testing here at home - it might be a while before I trust this particular RPI to navigation on my boat.