Hi all. I'm attemping to help a buddy that's experiencing (almost) the same problem. No lights on the extrenal switch. But it's not all : when the external switch is pluged to the X3, one of the power LED (5.0V I think, the at the bottom side of the XB), so I checked the 9 & 15 pin but nothing, so remade, still nothing. When the external switch isn't pluged, the XB frags (only if the D0, LAN, HDD wires are pluged) but both power LED are lit. And finally when nothing is pluged to the chip, the console just boots to the M$Dash. At the beginning I tryed to remake all his solder points because his XB just fraged whaterver he did, but now ... I just described what's happenning. All the solder points seem to be perfect (not "PERFECT" but sufficient). I don't know what to do to help him. I didn't experienced this with mine.
His XBox :
-XB v.1.3
-Pin header install
-stock HDD
Any help would be appreciable. Vietboi, if you fixed up your problem, tell me how please. Thank you.