I guess I need to disassemble my iBook 500MHz to get to the plug, which I am assuming is part of the board. How do I pop the back of the machine off to see what needs replaced? My local dealer told me it would be $495 + $95 parts to fix it. I am in desperate need of some assistance. When I plug in my other AC adapter, the ring on the plug lights up orange but does not transfer any charge.