What to do when the controller no longer turns on ?
Charge controller does not work.
The controller does not light up and does not vibrate
@Sentinelle The status light should glow a steady orange while it's charging. Is that not happening? Can you try a different charger and/or cable and/or outlet to see if that makes any difference?
If that doesn't work, you might want to try holding the Stadia button for 8 seconds to see if you get any sort of reaction. That should forcibly power it off, after which point you can try holding the button for 1 second to turn it back on.
And the last thing I'd recommend would be to factory reset the controller to see if that will revive it:
Let us know how it goes!