Our house in France has a satellite that the previous left. I bought a second-hand Amstrad DRX 400 from ebay pointed the dish (75cm) in the general direction and powered up. All I can get is "No satellite signal is being received". I've replaced the LNB and tried a different cable with the same result. Should I get some sort of signal even if the dish is not aligned properly? or is the digibox duff? Thanks