Connect TV to S-Video port on graphics card and turn TV on.
Reboot PC. XP will now 'see' there is a tv attached. No version of Windows
can 'see' a device that is turned off.
Right click on the desktop and select Properties. In the Settings tab,
click Advanced and then the Monitor tab. There should be an icon here to
switch output from monitor to TV. Note that audio will still emanate from
PC's speakers. S-Video is video only.