I fixed it!
Not being an electrician, I thought that the load line was the power line, so I put it on upside down. Then thought all night about it, and decided to go back to the instructions where I discovered I had the four wires upside down. Turned them around...and voila. Electricity is back. Potential lesson learned?? No extension cord in GFCI receptacle, as I think that's what screwed this up.