Well , I got home last night , pulled the graphics card from the machine and metered from pins 1 and 11 on the ADC connector to each side of the power tab on the edge of the board to identify polarity . Having done that it was just a matter of soldering the iBook power supply wires to the tab and replacing the board . On connecting up the Studio display - IT WORKS !! A very easy job ! 10 minutes max .