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Means to me that the old DC Power Jack, may have been removed from the DC Power Harness, and the $3 DC Power Jack soldered on.
1) Both red wires, (2 - Power), and black wires (2 - Ground) were used? 2) Are you sure the solder joints are good? Not cold solder joints?
3) The DC Power Harness cable is plugged in tightly to the motherboard? 4) Was a continuity test done with a multimeter, of the DC Power Harness itself after the new jack was installed?
Just to get the obvious out of the way;
5) AC adapter (Charger) was tested? Center hole is Positive, outside cylindrical metal shell is Negative. DC Voltage scale. Looking for 19 Volts (DC)
6) You FOLLOWED Anti-Static Precautions? What method did you use?
AC adapter checks out, modified DC Power Harness checks out, the problem is in the power section on the motherboard.
Power MOSFET's determine if the Battery needs a trickle charge, full charge, or no charge at all. Also determines if the laptop is to just run off of the Battery, or AC adapter.
Check the motherboard near the area the DC Power Harness plugs in, for burned, blackened, or blistered Power MOSFET's. Using HP Pavilion dv6000 series, and Pavilion dv9000 series Notebook PC's, as an example,
On the Mayohardware blog also look at the second photo down, with the Alpha and Omega Semiconductor - AO4407 - Power MOSFET, circled in Yellow. Click on the photo.
Look to the right of the AO4407. The small rectangular shape to the right, with the dark wide band on it is a Ceramic Capacitor. There is one above it, one above that one, and one to the right. Just some of the ceramic capacitors.
Need to pay close attention to the ones in the area immediately surrounding the Power MOSFET's, in the power section. See if any are burned, blackened, or blistered.
[ ......game out of the cdrom that was jammed in upside down? I would have removed the one Philips head screw from the bottom of the laptop, slid the optical drive ('cdrom') out, and removed the small screws from it's cover, then removed the disk.