Reciver can't detect swim and or swm code 775 and 771

Ok so I have a h25-500 direct tv receiver and a direct tv slimline dish I bought off someone model # SL3SWMPR1-WNC Rev1 I am getting colde 771 and 775 so a I've learned I need a power inserter and a swim splitter so I bought those still nothing my reciver still say can not detect swm I've reset receiver I've reset power inserter I have checked wire still nothing also I don't know if I have the satellite in the right position I also have the satfinder digital thing from Amazon and that won't even work don't know what the problem is could it be my lnb if sonhow so I know if it's bad before I go buy that also oh and direct tv I already called them and they were no help at all please someone help also how so I know if I'm using an all copper line I'm using one o had extra straight from direct tv from satellite to power inserter and RG6 COAX CABLE IM TRYINH TO HOOK UP IN MY RV AT HOME THE SAME RECEIVER WORKS AND IM NOT SURE IF I HAVE POWER INSERTER THERE BUT I KNOW I HAVE THE  swm SPLITER and yes I've done resetup of satellite can't detect again I enter sl3 /none/ swm  still not detect swim