I've tried directly connecting to all four LNBs, both the new and old, with no luck.No it sure does not. OK; we've got 18V at the LNB end of your coax, so I am guessing it's not the coax and not the 6131. You told us above that you already tried replacing your LNBs and your SW21 with no change. I think you have multiple failures. Let's leave the switches out of the picture and direct-connect the 6131 to each of your (4?) LNBs in turn. I think you tried some of your LNBs directly, but did you try all 4?
I've tried this multiple times with all three switches, both sets of LNBs, and with a direct connection to a single LNB.Have you tried disconnecting coax from stb then running check switch to clear the matrix. Hook up coax again then run check switch again and see what happens.
I've moved it a bit, mostly when I was trying to find something with the single LNB hookup, but I marked where it was set originally and have always moved it back to that position.You said you removed and reinstalled the Coax and never moved the dish. Are you 100% certain that the dish was not hit or inadvertently moved even though it was not part of the plan?
Is there any reason the receiver would just stop recognizing everything just because it was disconnected from the dish for a couple weeks?It's got to be the receiver doesn't it?
Swapped cables with known good equipment and problem did not follow the cables (therefore cables ok)
Tried multiple switches with no luck (probably not the switches)
Tried multiple LNBs with no luck (probably not the LNB)
The only constant has been the receiver.