There is no charge LED. Only the GUI indication on the homescreen. It does do nothing without a sufficiently long holding of power button. Then a few seconds after release it starts to boot.
Some cables or PSUs or Computer ports may not work. I've had two dodgy cables, one worked on a Kobo and the other worked on a Kindle, but not vice versa! I've one PSU that's mysteriously detected as a computer host.
I have the Mars.
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