If you moved an Orby dish, you're just not aiming it accurately. The target is very small. Moving a dish a short geographical distance is a matter of making sure the mast is absolutely plumb and very slowly turning the dish across the identified azimuth with the bolts just loose enough to allow movement. Don't adjust the azimuth or elevation. If the end of the mast that is in the dish's mounting sleeve isn't absolutely plumb (vertical) to the Earth (eyeballing isn't sufficient here), you will regret it. There are more than a few YouTube videos on how to aim a small satellite dish.
If you're installing an Orby dish as your first satellite dish installation, you may have bitten off more than you can chew. If you're installing an FTA dish, the same is probably true but there is a lot more ways to go wrong.
Power lines may reduce the signal but they shouldn't kill it.