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I tried many times the long press (yes, I got the blue light), then I waited, then I tried long/short/medium press : the result is always the same.
I also tried to disassemble it, following your instruction : battery disconnected and reconnected. No difference.
The only difference I got is that since I also tried to detach the screen, the hibernation screen now faded away nearly completely, but I can still see it.
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