A bad connection with the power jack. If the power cord is moved or wiggled, the power goes off. It appears that the connection on the inside of the laptop is broken.
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What needs to happen is on the motherboard underneath the power jack, there are solder points that have hairline cracks in them. The best way to fix it is to remove the motherboard from the laptop and to resolder all the solder points for the power jack.
Once you do this then the power should stay on cause wiggling the power cord won't cause the laptop to turn off.
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