First conntect it to the TV, and then go into the display settings and set it from Monitor to TV which should make it start outputting from S-Video
Right click the desktop, go to Properties, Settings tab, then Advanced. Go to the Displays tab and then when you have it plugged in the TV display should light up, allowing you to confugure the settings. It should then appear. I've tried it once, and did get some output thoguh the TV wasn't suitable.
I hope this helps