I just loaded the game on my system so I could verify where the receptacle is supposed to be. It *should* be in the middle of the top "green snake" row, the thick one. It's in the wide area of the door jamb, not the skinny one. And it's definitely not there on your screenshot
My suggestion is to copy your savegames folder and roster.dat files, and then reinstall the game. Perhaps something went kerplooey during the install... or perhaps there's a bad image file or something. If that doesn't work, we may have another option or two, but they're getting very limited