Sounds lie you not pointed at the Birds (119 & 110). When you run a " Check Switch" do the receiver recognize the Twin and or Switch? If so, you need to re-peak the dish. Sorry, but if it was only one receiver it would be equipment. Hope this helps!
Take a good look at you dish. First make sure that the DPP Twin is in the correct slots(You'll see on the lnb bracket "129, 119, 110). Second the installer may have aimed your antenna with the wrong port on the lnb (Aim with far left on the lnb).