Brents:
Does your dish have an Dual throat or quad (dual throat as well) lnb like any of these? it needs to have either. If its a single throat lnb, it cant look at the other satellite. Also, do you have and amp or muti-switch in your system? This will stop the decoder from sending 13 volts to the lnb to switch throats as a multi-swich feed 18 volts to the dish.
Dual or quad, I have no idea. There is one cable coming off it, thats all I can see.
There is a device in the roof somewhere that that cable goes to, and the Freeview aerial cable as well, then cables go from there to the 2 TV/Sky locations. One of those locations (dining room) just one cable comes out the wall, then a splitter of some sort sends Sky down one cable and Freeview down the other. I'm not sure how it works in the lounge.
Sounds like there is no way Sky's test should have returned a successful result.