Shake the little power supply that plugs into the wall. I heard a rattle in mine, so I took it apart and found the wires that go to the prongs that plug into the wall socket are not securely attached. They are just wedged in between the plastic and the prong. That alone is frightening. So I put I just wedged it back in place, and it is working again.
Found no power coming out of the 36V power supply that plugs into the wall.
Same tree, same problem. What a P.O.S. only worked the first time.