Charging light turns on, but power button does nothing

When I insert the charger, the orange light comes on.

Pressing the power button does nothing. The charging light will stay on.

I tried different charges (they work on other consoles), different batteries (they work on other consoles), cleaning the power button pad with isopropyl alcohol, checked the F1 and F2 fuses, charging port, battery port, all are okay

Of course I also tried restarting with the battery out, with and without the sd card.

The sd card by the way, is empty. Not a single folder inside.

What could be the issue and more importantly, how do I fix it?