Don't have the answer yet, but this should be simple. If someone out there has a 600 Mhz iBook, or a new 15" AlBook, could you please tell me which Book you have and whether your power cord extension has a 2- or 3- prong connection to the wall switch? I looked at the Apple specs and they both take different power supplies, so I do need to find out which is which. Thanks (again), Brian