Gamecube motherboard GND?

[Darkwisdom]

I'm pretty new to gamecube modding and portabalizing.

So my question is noobish and probably foolish. Where is the best GND point on a gamecube's motherboard, or is there a better point i should use when portabalizing? My soldering skills are pretty decent, and i've got a steady hand, so complex soldering isn't a problem for me.

I know that for electronic ground points there is a central point for all ground points, but i'm unsure where. Thank you in advance, sorry if my question is silly and don't slate me for it please.

[ModderMan]

Find the power jack, find the negative pin and using a multimeter just test various points like the shield or were it touches the board. There will be various points for GND on the board.