I had a new roof installed today and now there is no signal. Dish Network, Dish 500 system with a wing to 61.5 for HD. I've tried the point dish screen and don't get any signal on 110, 119 or 61.5. My contractor said the dish could be out of alignment because the old roof had two layers of shingles that were removed. Could that be enough to knock out the alignment? Should I just call dish and explain the situation or try re-pointing myself first? Thanks.