Power Mac G4 (AGP Graphics/Gigabit Ethernet). Power-management chip reset instructions by model Read the relevant document throroughly before proceeding.
However, some of the documents include that information as part of other troubleshooting or repair activities covered by the article. Most of the AppleCare Knowledge Base documents linked in the table below directly address resetting the power-management chip for a specific Mac model. Instructions for resetting power-management chips Thermal conditions, including fans and fan speeds.
Battery charge, including monitoring charge level and controlling charge. Peripheral device controllers, such as for USB® or FireWire® peripherals. Controlling power to other ICs, including:. Processor and bus slewing, which adjust processor performance and hence power consumption to workload. Power management in startup, run, idle, doze, sleep, wake, and shutdown (off) power modes. Depending on your Mac model, power-management activities can include: The activities performed by power-management chips have become increasingly sophisticated as Macs have evolved. CUDA: Capacitive Unit Discharge ASIC (Application-Specific Integrated Circuit). Depending on when your Mac® was built, the power-management chip is known by one of the following names: Types and functions of power-management chipsĮvery Mac includes an integrated circuit (IC) or microcontroller chip responsible for all of the power-management functions of the computer. Lists of such documents in other AppleCare Knowledge Base documents are incomplete, omitting information for older Mac models. Finding specific instructions where available by searching the AppleCare Knowledge Base can be difficult due to the various types of power-management chips employed in different Mac models. It was developed for the following reasons: 
Links to AppleCare® Knowledge Base documents containing instructions for resetting the power-management chips in specific Mac® models. A brief overview of the types and functions of power-management chips used in Apple® Macintosh® computers. Resetting the power-management chip in your Mac
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