Program Notes: CentOS Laptop Coming

That is, if I can get this inherited machine working.
Traded for a Dell Latitude D620. A decent system, but the power jack appears to be disconnected inside. Works okay if the battery is charged up, but none of my Dell bricks are recognized, so the thing won’t charge itself.
I’ve only found instructions on the Net for fixing generic power jacks, but I believe Dell has some added wires. I also some limited instructions for dismantling this particular laptop. What I need is some fairly detailed guidance fixing this particular problem, or at least how to diagnose it better. There’s no way I can afford to send it to a shop, and I’m not real handy on taking laptops apart. About the only other option would be find a docking station cheaply.
Anyone out there willing and able to help me with this?
Update: I got someone competent to agree to look at it for free.
Update 2: Aborted. The Latitude will be unavailable. Making a substitution.