This hp dv4000 came in with no signs of life. I couldn't wiggle or position the ac adapter plug in any way to get it to charge or power on.
It uses a less common five pin, 1.65mm dc jack.
When the laptop was completely taken apart I could see a separation where the voltage pin meets the motherboard. This would explain why I couldn't get it to power on using the wiggle trick.
After de-soldering and re-soldering a new dc jack on the motherboard the laptop powered on with no problems.
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