A few months back sky sports news hd and mix hd, plus bt sport3 hd would not work for me, everything else was fine, turns out it was my cable leads and a couple of splitters that was causing the problem, replaced them and they then worked, no problems since, try putting on the sports channel that isnt opening, then tamper with the cable a bit coming from the box and the cable going into your splitter/s, see then if your channel comes in then if id does, replace.