Apple released a new SMC firmware update today for the original (non-unibody) MacBook Pros. This update further refines the fan behavior to try and keep those graphics chips cool. Highly recommended software update. Keeping your MacBook Pro running cool is the best way to keep the machine healthy.
MacBook Core Duo Fan
At this point most owners of the core duo MacBooks (1.83GHz or 2.0GHz) have probably addressed issues arising from problems with the firmware that these books were shipped with, however, we still see these problems with some regularity.
These problems could manifest as, but are not limited to, issues with backlighting, sleeping and waking for sleep, charging the battery, fans, and temperature controllers.
These problems can be fixed with Apple software update or with the EFI or SMC updater in System Utilities. The Extensible Firmware Interface (EFI) is a small program residing on a chip on the Main Logic Board that helps Mac OS communicate with the hardware. Similarly The System Management Controller (SMC) is also an integrated circuit that helps control certain functions such as the Fans that also interfaces with the Main Logic Board.
It is important to follow the on screen instructions provided for the installation of the EFI and or SMC updates, failing to do so will not properly install the firmware. In most cases this means having a working AC adaptor or a working battery.
