You are trying to just get a new graphics card, correct? Like for example buy a GeForce 4. All you need to do is open the PC. Install and screw in. Plug the monitor to the new graphics card, boot pc up. Then install the drivers. That is all you need to do. Just ignore the old monitor port... Does that answer it for you? If not I will be back or feel free to email me.
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-hKzKnight
"The ghost... Was never there and you'll never see me"