My best guess is that the dish got pivoted side to side. See if it can be gently rotated a little left and right while someone inside is checking to see if channels show up. Next you can try gently pushing up or down on dish (I doubt the kids accident changed this though). Since you have no signal now, you have nothing to lose until the tech comes. After you do somehow get it re-aligned properly; use a permanent magic marker to mark the elevation and the the position on pole, then you can tell when its not right. There are some cellphone apps to help you re-align it too.
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