A:Answer I had the same trouble, charged them all night and they still wouldn't turn on. But I found a fix. Gently remove the foam cups from the ear pieces and look for a small hole (distinct from the speaker holes) on the inside of one ear cup. This is the reset switch. I don't recall which side it was on, unfortunately, but just use a paper clip to press the button inside that hole to reset the headphones. They should power on after that.
Hope that helps.