A couple of possibilities. Since an eInk screen is bistable, nothing is writing to the screen. This could indicate that when your Kobo was opened, the display ribbon cables were displaced or damaged so the electronics are not talking to the display. In that case, I would still expect to see the power LED active when you plug your Kobo in. Another option is that the motherboard is defunct in which case your Kobo is pretty much on it's way to the electronics recycling bin.
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