The book is almost new, it's been 3 weeks my wife's been using it. Hardware issues? Don't think so...
The red light doesn't flash, my mistake. It goes on. After being fully charged, the green light went on. Seems like some software problem after installing new firmware. The only question is: why does the boot up picture never leave the screen? Even when switching the battery off.
Oh, one more thing. If I'm trying to insert the SD card and start the firmare installation again - the installation process goes on, then it goes "Update successful. Please turn the power on to restart", then I stick the SD card out and press the power button and see this boot up picture hanging again.