MacBook SMC Firmware Update 1.4
This firmware update addresses an issue with certain MacBook and MacBook Pro models from 2007-2008 that prevents them from charging with new power adapters.
Your computer's power cord must be connected and plugged into a working power source, or your battery must be at least 25% charged.
For more information see "http://support.apple.com/kb/TS3499".
When your computer restarts a gray screen will appear with a status bar to indicate the progress of the update.
Your computer's fans will run at full speed during the update but will return to normal speed once the update completes.
Do not disturb or shut off the power on your computer during this update.