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"cost efficient" is get yourself a cheap inverter and use your existing power brick. this method also falls under the categories of "energy inefficient" and "runs hot" and "noise in audio playback".
You should spring for something like the carnetix P1900 to power your laptop and the LCD screen which I'm thinking you'll want.
As that is a P4 laptop, make sure you place it in a well ventilated area cuz those things get hot (they burn the giblets).
Well, it's a laptop, how do you normally start one up? by pushing the button. how does your car push a button to start the laptop up whenever the car starts up? soldering in a relay or something similar is the most direct way to access the button, but the electronics could still use some intelligence to handle startup and shutdown, and that's what the SDC boards are for. The board handles the intelligence, the soldering lets that intelligence actually push a physical button.
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