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It really sounds like the classic-dc power jack solder joint is broken. if you can, try moving the pin that is in the jack- if you detect movement, can actually cause the connection to work, the jack is most likely the problem. the amount of movement is very slight, hair's breadth is all that’s required. Given that the wrong plug seems to work, I would also have to think the jack itself may be broken
One solution that’s often posted on TSF is to purchase a new jack, take the laptop apart, and and take the mobo to a tv repair shop and have them solder the jack on
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