Computer: Pismo with G4 accelerator card; Tiger

Problem: The computer doesn't always recognize that the power cord is plugged in. I've tried known good power cords. If you "jiggle" the power cord and hold it there at an angle, the computer does recognize the power cord.

Questions: Is there a simple fix to this without having to take apart the computer? If the only solution is that the DC board needs to be replaced, will a Lombard DC board work. (I have a partially functioning Lombard that is available for parts and I am comfortable with doing the repair myself, even though accessing the DC board means pretty much taking the whole computer apart.

Thanks!