I am having a problem with a Hughes receiver. For some reason I can not receive any of the high def. channels. When I switch to them the screen goes to black. I am using the component cables, and am pushing the action, source button to switch the box to highdef. but I do not get a picture. I have also made sure that the box sees the three lnb dish, so I do not think that this is the problem. I am wondering if it has anything to do with the signal strength. One is hovering around 80, while the other is at 60. Could the lnb that is giving me the 60 reading be bad by any chance? Any help would be appreciated greatly.