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Do any TVs allow me to turn off overscan?

All TVs that do not have direct digital display technologies (my terminology, basically anything other than screens that light elements that you see directly, that is, CRTs, rear projection, etc.) are probably designed to have overscan. This is because there is no way for them to get a clean line at the edge of the picture, so they hide the raw edge behind the overscan. There is no reason for a TV that does have direct digital display (plasma, LCDs, etc.) to have overscan, as they shouldn't have an unseemly raw edge. Heck, even films projected at the theater have the equivalent of overscan, and filmmakers, both for TV and film, take this into account when shooting.

The reason I point this out is because if the TV is designed to have overscan, there is a reason for it. If you were to hook up an HD-DVD player to such a screen, it would "suffer" from overscan, too. So if your intention is that you want to be able to watch videos on the screen just as if it were not a PC, then you don't really have to worry about overscan any more than you would if you were just buying an HD-DVD player.

Of course, if your intention is to use it as a PC, then that's where the concern becomes valid, as the Windows taskbar will get chopped off, for example. But if you have some sort of dedicated software that is intended to be used as a media computer, I'm sure that the developers have taken that sort of thing into account and made the UI not rely on the very edges of the screen.

This may be obvious, but no one has said it and I thought it was worth pointing out.
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Bitt Faulk