ok my cousin was having the same problem and we used my dish to find the signal and bingo signal was ok....I had to play around with the LNB and remap the channels a couple of times... make sure your LNB settings match your STB settings as well ie if you use a 11300 LNB make sure 11300 is set on your box ....dont know if the 3100 can use a Universal LNB though....