X-Vision CCTV 16ch Multiplexer problem

[radioguy 0]

I have a X-Vision CCTV 16ch Multiplexer which is brand new out of the box. When I try to enter the main menu via the instruction 'Shift' and press 'Box' key at the same time - nothing happens except the 'Shift' word flashing on the screen. It is attached correctly to a Vista VHS VVR-960 recorder. Also the multiplexer is not recording any of the cameras on VCR button playback from the multiplexer. I consider myself technically minded but can not find out what is causing these problems. Can anyone suggest a possible solluction? Thanks.