Hey, no need to apologize. It was the silence of people who really know their way around this stuff that was getting me down. I'm glad a few of them have made some suggestions now.
Still, the problem isn't fixed. I posted the photo to show that springs in the SD-card socket look good, so they don't seem to be the source of the problem. I suppose I could have a bad card.
Anyway, post again here if you get yours to work. I'll do the same on my thread if I have any success.