Lapbook Air not working!


I have a Lapbook Air (Model Number CWI529). After some Windows 10 update, the laptop is not working anymore.
And when I say “not working”, it is in a state where, if I press the power button, the green LED light up for 15 seconds after going black again.
Nothing on the screen. The charging LED is on when the charger is plugged.
Nothing change if charger is plugged or not.

I checked a few topics but most of them are for the tablet variant (so no “volume button” and stuff).

What could I do?