Acer E5 Charge Light But No Power - LFC#237

This Acer was running just fine, and then suddenly wouldn't turn on - apparently without cause. Charger is fine, battery charges. How do we approach this?
Spoilers down below:

Bad keyboard, power button had failed. In the video I show how we can test for this without having a spare keyboard on hand.

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Видео Acer E5 Charge Light But No Power - LFC#237 канала Adamant IT