It's a Kindle 4, was a Christmas present. Screen froze on sleep, couldn't wake it up. Tried plugging into laptop, laptop didn't recognise it. Finally, thank heavens, computer worked out what it was and started to charge. I ejected it from the computer (which means it should carry on charging but I should be able to use it) but when I tried to press the power on button it just switched off and now won't start. :-(
Does anyone know what to do, apart from scream at Amazon?