Well, it turned out that the battery was the main issue in both cases. The black Kindle (non-3G) is now up and running. The white one (with 3G) has a broken screen. Obviously it was broken between the time its battery went dead and the time it had a good battery put into it. I hope it wasn't done by me when trying to get the back cover off (but it could have been, the battery was swollen and it made the cover hard to remove). Not all is lost, however. I now have another working Kindle 3 (Keyboard) and parts (including case, mother board and 3G module) and (I just realized today) the cover the white Kindle came in was a working lighted case. So, all and all, the ShopGoodwill turned out pretty well. Besides the two Kindle Keyboards (detailed above), the NST just required a new battery and it's working great (almost new condition) and the Sony PRS-300 worked "out of box" as soon as it was charged.
So, I guess, even though the old Kindle battery showed 4.22 volts, its amperage must not have been up to snuff.
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