Doom and gloom..tried all combinations, no luck. I've got red light from the fire cable going into the input of the TV unit, handily the plugs are marked with in and out arrows..red light coming out of TV unit and into the BT phone module on top of the TV unit, but still got the Land Rover screen showing with no controls on the screen module working. I suppose I'll have to wait for the link cable to come to bypass the BT unit next week. But another thought, take the output cable out of the BT unit and see if light comes out of the plug, a job for tomorrow. Is there anything else I can check, = - at the TV unit grey plug? The unit seemed to power up when I installed it the other day, the cooling fan worked. Maybe a fuse to check somewhere? But then would the red light pass through if the fuse is blown?