Just switched out our old SD Tivo R10 boxes for new TivoHD units and hd dish install. The new boxes are fine, couldn't be happier. The third receiver had always been an old SD receiver (with no dvr function). It worked fine after the HD changeover (naturally as an SD receiver). Tonight I decided to switch out this box and put back into operation one of our old R10 boxes. CAlled DTV, gave them the card number etc, but during setup, it fails to acknowledge 1 out of the three transponders. We tried different configurations of dish type, lines in, but it does not work. No one at DTV can help. Am I wasting my time? Will the R10 just not work on an HD dish setup?? Am I missing some sort of splitter/multiswitch/gizmo that was present in the old SD dish setup, that is now not there? Finally.........should I even bother with the R10, with those restarts I was experiencing a month ago, or was this issue fixed? EDIT - from another forum it appears the R10 is not compatible since I am now using SWIM splitters. It mentions using a 'legacy port' but I am lost.