I have a place with previous cable installation thru out the house that was used by the original owner with a local cable tv provider. I have purchased a Slimline 5LNB directtv dish with 4 connections for cables on the LNB. I also have bought a power inserter and a swm 4 way splitter SWM (green), not sure if I need these or not. When the 4 way is used the only sat signal I get is from the first connection and the other three get nothing. I've also tried hooking up the power inserter on the main port of the 4 port side going into the power to swm and the ird to the receiver (careful not to fry the swm). After that was hooked up the other receiever still wouldn't get any signal. I have tried a coupler with the other 3 lines leading in the house and nothing seems to have a signal. I thought I could run lines from the LNB to the 4 cable lines already run to the outside of the house. Any ideas what the problem is? Thanks so much in advance for your help with this issue.