Hi - I moved into a house with a Nest thermostat. It has a disconnected power supply. All the videos say to put one wire in the C hole and the other into the R or Rh. There is no Rh and the R has a red wire. There is a red, white, blue and green wire coming from the wall. The Blue is plugged into the Y spot, the others are inserted accordingly. The only open spots are the C and a OB/* spot. Where on Earth do I plug in the second wire from the power adapter? The unit runs fine on batteries, but I don't want to worry about batteries all the time or recharging.
Here is a picture of the unit.
