Are you
Are you sure you are on a Satellite? You will need a meter to make sure you are and getting a signal before anything else. Like I said, you can purchase a cheap meter for Less than $10 bucks and that's where you need to start.
One quick test is to have someone switch the channels, you stay at the dish and listen to make sure the polarotor is switching Between Vertical and horizontal. That will rule out polarity...On the Polarotor you should have a little Blue Box and it should make some sounds...You should be able to hear it pretty easy...Just guessing you are not using one of the newer feeds but the original?
You really need a meter...
One other thing, make sure you do not have Bee's nests in the LNB and polarotor..Seen that cause hair pulling several times...
If you are positive you are on a Satellite and you are positive you are getting a signal...It would be my guess you are not on a Satellite or getting any signal or you are not on the Satellite you think you are...
I guess it would help to know exactly what type of equipment you are using as in way of C-Band dish, LNB and such...
A C-Band dish can be very difficult to get on target but once it is, you are set. It would make your life a lot easier to have a good meter or someone who has experience with larger dishes.
is the Pole Plumb? I mean dead plumb? You have a clear shot to the southern skies? Did you use some sort of Satellite finder program to get your setup information? If so that is not always exact..normally a couple of degrees off..
1st dish I installed was a 12 footer..It had already been set up before...I had it in my head all I had to do was plant a pole and reset the dish on it and point it at the south. Because it had already been "adjusted"! I didn't consider when I moved it those things might change. So I adjusted everything thing on it...When I was hairless I called a friend and together we managed to get it installed in a matter of hours. I was lucky, I found a working receiver at a yardsale and another at a thrift shop. Both had signal meters on them and at that time several satellites had some analog feeds still going on...