I recently bought a Thomson Sky box and dish off a friend at work. When settingit up i put the dish on the wall and put the cable through a window to a TV so someone could tell me what the signal strength was like. After I got that spot on and all the channels worked I put it a cable through the wall, (which involed patching two cables together) and put the box into the room I wanted. The signal strength was just going up and down, giving a 'No Signal' message on screen. After playing with all the conectors, I then went to no signal strength and then to half. I now have the 'No Signal' message on screen, but if it is left for about 30 seconds on that channel it comes on. Any ideas what is causing it?