Satelites Direct TV question

I have 3 TV one is the main room,s Iam using the sony
satellite HDTV receiver all channels are there,
on my two room Iam using both Direct TV cable boxes,
one receiver is only giving half of the channels,
the other box is always saying Satelite is searching for
signal, takes forvever.What is the problem here?
Although I was told by Direct TV, dish is not the problem.
I need your help Agoners, Thanks.