Hooking up a computer to a Plasma television can damage it, depending on what you are doing with it. Plasma TVs can burn in, if a static image is left on the screen for a long time. If you are going to use it for web browsing or other computer applications, this can occur with the frames or start menu. Instead you should buy an LCD which will not have burn in for hundreds of thousands of hours. Video or a constant power point presentation would be fine.
something i thought would help: if it has a VGA/DVI input connection then you should make sure you get a graphics card with the capability to run at the highest resolution possible, something that will cost you alot, anyone have any idea what 42" would need for a resolution (e.g. 1024x768...)?
Check on the TV itself, they say what resolution the support. Also, plasmas have yet to prove their reliability so it may not be wise to use it like that yet, and they burn in much more easily than a regular CRT. Hell, even LCDs can "burn.
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