Are you telling us that the receptacle has two straight pins and one U shaped pin with a black wire connected to the green grounding screw on the receptacle?i am using a receptacle test on my outlet and getting "open ground" error. i see there are 3 hot wires and 2 nuetral wires. 1 hot wire is connected to the ground terminal. would this mean i have 3 hot wires and no ground???