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If you have a different charger plug-in and cable, from some different electronic device, connect to that for 24 hours or more. Then after it's had that full day to try and charge, try holding down the power button for a minute or more (time it, don't guess) while it's still plugged into the charger. If that works, consider upgrading the firmware on the device if it's not the most current version. And/or consider performing a factory reset. The device will have to be responsive before you can do either of these things though. If you can't get it responsive on your own, call Amazon and let them deal with it under warranty.
FWIW, when my Paperwhite was young, it would freeze up intermittently. I was always able to get it unfrozen using the above technique. Upgrading firmware did not keep the freezing from returning though. So I sent it to Amazon. They supposedly upgraded the firmware (although it was on the latest firmware before I shipped it to them). They sent it back, and it would still freeze up. And then ... it stopped freezing up all on its own. I did nothing to it. It just cleared up its own problem by itself. It hasn't frozen up since (the last freeze was years ago).
My experiences weren't exactly the same ones you are having. But there was a time when I could not get mine unfrozen easily. I tried and tried, as you have. But it wouldn't unfreeze. But leaving it plugged in for a long time, and then holding that power button down for a long time, eventually worked. Either that, or it was coincidence. But it finally unfroze.
I think the problem with these devices is that they are never turned completely off. They are still operational at a very low level even after you have turned the power off (because you are not really turning them completely off). That's why they say "hold the power button down for 40 seconds". That wouldn't do anything differently than holding it down for 1 second if it were truly powered down. But it's not actually powered down. So at a low level it can still "time" how long you hold that power button down for (unless it's totally lost its brains). It may be that all's they need is a good solid power-down reboot. But you can't actually do a solid power-down reboot. Letting the device sit unused for months and months while the battery completely drains itself is not a workable solution to get to a solid reboot. I think they need a separate reset button that TOTALLY AND COMPLETELY disconnects power and also facilitates draining any capacitors holding residual charge.
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