After years of limiting myself to running trains under the Christmas tree I am now well along on building my first permanent layout. It measures 22x8 so I have started out in a big way. There are three connected loops of O/O27 with a single standard gauge loop going around the perimeter so that I can run my fathers old set. I am using both sides of the Z4000 wired through one TIU. For each gauge I have both PS2 and conventional locos. For the O/O27 I want to operate PS2 and conventional simultaneously on separate loops and thought from the wiring options described in the DCS handbook, that I needed to use the variable ports on the TIU. The problem is that I can't get any power to the tracks through the variable in and out ports even when using an MTH 1000 brick as an alternative power source. Being new to this technology, I have now illusions about my lack of knowledge in this area so I have paid close attention to the instructions in the DCS manual. Either I am missing something or there is something wrong with my TIU. Any advice on how to correctly set up my operating system will be appreciated.