LNB

[Vet]

I have a Primestar Dish a Pansat receiver Everything works great. I found a
Primestar Dish. I took it too Atlanta. I took off my LNB that works on my
primestar and put up the Primestar Dish that I found . I also hooked my
receiver that is mine that I know that works and I know that it is aligned
and is on T-5 Sat.
I got nothing.
I took my LNB off and put the other LNB that I found with the Primestar Dish
on and it works.
My question is why my LNB does not work that I know it works on my dish and
the LNB that I found with the Dish work?.
I put the LNB back on my Primestar Dish and it works It does not work on the
dish I found?
VietNam VET 69