Thank you, davidfor and Desdinova, for your very clear instructions.
I've charged the reader for one hour, as recommended. After that, I have tried all the reset types, they simply don't work (no light blinking either in red or white, no thrill of the screen, nothing!).
I really don't know what could have triggered the device entering the coma, without any prior warning whatsoever. I am really so puzzled and disappointed, I have to admit (though I don't blame Kobo in absolutely any way). It was a unit very well taken care of, with protection cover from day one, as you would do for a book you really love and care about.
In the meantime, I wrote to the Italian seller, no answer up to now, but to be honest, I expect some bureaucratic obstacles and I tell this from my own experience with a previous unit (another H2O, bought from Germany) which they have refused to take back, although it had some very easily proven failures.
Koboy, don't worry, I wasn't gonna open it, but thanks a lot for the warning!
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