Apple has released MacBook and MacBook Pro SMC Firmware Update 1.4 which addresses an issue with certain MacBook and MacBook Pro models from 2007-2008 that prevents them from charging with new power adapters.
The firmware is available via Software Update and also via standalone installers.
More info and download links:
• MacBook SMC Firmware Update 1.4
• MacBook Pro SMC Firmware Update 1.4