I would guess that the number of non-functional Kindles (that never work to start with) is pretty low over all, but that some do fail to work just like with any electronic device. I'd guess that they do quality checks on each run of units to try to catch the occasional bad one as well. Maybe each kindle is powered on and tested before it's even packaged. Sort of a final inspection if you will. It would make sense that that does happen just as it would make sense that a few do slip through by not failing right away.
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