I've got an iBook power supply and a power input board (aka "DC-in" board). When I plug in the PSU and connect the output plug to the power board, some glitchy things happen with the indicator light... It's rather random so it's hard to explain, but basically, when I touch the metal fabric sheathing on the output wire bundle (the wires that connect the power board to the logic board) the light glows amber, though dimly (it flashes very frequently, like PWM dimmed), and when I touch the shroud of the plug or any metal pieces nearby that are connected to that shroud, the light glows green, though dimly (PWM). And if I touch both, I think the green overrides the amber, but I'm not sure... I don't quite remember, but I know for sure one overrides the other, not make both lights glow at the same time. But there are variations to this. I think the green only glows when I am grounded, so when I am not grounded, it won't glow, but the amber will still glow even though I am not grounded. Though this is often not the case and sometimes it does other random things... Well anyway, how does the board work? How does the board tell the plug what light to use? How can I control the light manually?