I am in need of some advice.. I have a customer that is having a problem with getting a black screen. she has 2 h24's.. she had dish.. I have been out here 4 times trying to figure this out.. I have replaced the lnb, (swm3), the line going to the dish, the 2 way, the power inserter, the ird.. even swapped ird's.. but for some reason the screen just goes black. sometimes it will go for a few hours and all is fine then black screen (no msg like 771) once it happens you can go to signal screen and its all good but still black screen. what i dont get it is it happens on both boxes not at the sametime and for some reason it more on one box more then the other.. any suggestions??