In the advanced section of your graphics card properties screen you should have a option tab for Device Selection - usually that tab will have radio buttons for selecting analogue monitor or TV. If they are not there try installing the latest detonator drivers. Hope this helps.
One more thing - the GEFORCE 3 only has 1 RAMDAC so you can't view TV & Monitor at the same time - If you want to use your PC through the monitor and watch a DVD on the TV at the same time you'd either need another video card with twin view capabilities or if it's just for DVD decodong a hardware decoder card with TV output. I had a creative DVD decoder card, but it was too old for XP...the win 2000 drivers were none too stable and unless I find some new drivers I won't give it a try. I'm considering going dual boot and putting win 98 se on, but I'm not sure if 98 will boot on a dually - it might freak out as it can't cope with 2 processors, but then again it might only recognise the first one and be OK...or I could just put the card in my other rig which is running ME with an old Athlon 600...should be up to DVD playing!!
Ep, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS