I've had a few heart-stop moments early on with mine, but it has always come back to life.
A couple of things -- it can take a while from plugging the charger in to get enough power into the battery and system to allow the CPU to wake up and turn on the LED. Daft, but it is a common situation where the LED is controlled by the CPU, so it takes time to get the LED to come on.
Secondly, I use a "shaver" adapter to plug the charger into a UK plug. Those I have all have fuses. And the fuse had blown on a couple of occasions. (I'm sure you can imagine my incredibly stupid embarassment...).
I'm not convinced that the USB is able to provide enough power to do anything other than trickle maintenance of the battery. I avoid using it when possible (even when I know the USB can provide a much higher current).
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