Right, now show me the way back ;) just kidding,
thanks to this really great tutorial I've just fixed my daughter's beloved whitebook
hope I can assemble it back, now ;)
for those, who didn't find the solution in cable or inverter replacement:
the very common problem here is a zero ohm resistor, which serves as fuse here
this tiny beast just loves to be burnt, and residues nearby the inverter connector slot
you may find pictures here:
Voltages of pins on logic board where inverter cable hooks up..
and appropriate video here:
long live, white apples!