I know the connector it is very unusual and never seen it on a laptop but the charger itself is identical the one you get on laptops. I am not quite sure why their are four connectors though.
Could you cut the wire on the old one and see how the connector is wired up? I am thinking a TV type repair shop might be able to make you a charger up quite easily, as 19v laptop chargers are standard but they usually only have the +19v and ground connectors on them so I am wondering why this one has four pins.
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