Uverse receiver power supply issue - DirecTV

My Uverse power supply stopped working. The box just shows a blue screen. When a power supply from another box is connected, it works fine.

I chatted with Uverse support yesterday. They told me to take the power supply to an AT&T store and get a replacement. I went to the store and was told that this is not the case.

This cost me an hour of my time, so I would like to know how I go about getting a replacement power supply?

This question, "Uverse receiver power supply issue," is about DirecTV channels, programming, equipment, and sports.