Quote: from espresso8097 at 2:54 am on May 7, 2008
It is done from the video card. But there are external devices available that can send out the same signal to two different monitors (TV=monitor). If you are building a media center PC for use only with a TV then you will only need the one monitor (TV). But most (if not all) modern video cards offer 2 DVI ports out anyway. You can now be presesnted with two options that I would recommend for video signal methods. A DVI or VGA cable (from DVI port with a small cheap converter, one usually comes with video card) from the PC to the TV. Or you can go through methods such as S-Video or component video cables if your video card supports it.
As for sounds through the PC things can get tricky, if you have specific questions I may be able to help.

S-video is not HD.
To the OP: It all depends on what you're trying to do. Are you trying to watch TV/movies/etc. on your computer while being able to use the computer or are you just trying to use the monitor as a display for your computer and also TV/movies/etc?
If you're trying to show HD content via your computer, obviously it's through your video card. This route allows DVR-like capabilities to your computer, providing it has neccesary specs.
If you're just trying to use the display for multiple purposes, just use the inputs on the display.
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smd
LiveWire points are overrated; a currency for artificial respect.
A very funny read