A few weeks ago, I started a thread
here about a Kindle Touch that freezes intermittently, then flatly refused to start at all.
Initially, I thought it was a battery issue, but after buying another Kindle Touch (with a known-good battery), and trying the "new" battery in the old Kindle,
the old Kindle still refused to boot with the new battery. It would freeze at the Kindle screen, sometimes with the word "Kindle" in a lighter font than is usual (thought it was an illusion, but I confirmed it with a side-by-side comparison with the other Kindle).
Diags mode does nothing (the Kindle would refuse to leave diags).
However, it managed to boot once. Only once. Then it died again.
What can I make out of that mess? What could I possibly do?