Generally the trick to getting video to display on a TV is that the TV has to be on when the system is booted and detected. TV's are notoriously bad at not being hot plug or plug and play. So basically, turn on the TV, change it to the correct input like S-video, then power on the PC. You should get video, if not, go to the display properties and make sure the TV is seen and is an enabled display.

I'm not sure how much your security hub thing will interfere with it. If the PC doesn't know that there is a TV hooked up to it, it wont push video out of that port. If you continue to have problems. Get it to work on one system and bypass the video hub thing, then work out from there.