Which of the following connectors is responsible for supplying power to all components except the CPU?

The mainboard power connector is crucial as it supplies power to all components of the motherboard, including devices like the RAM, PCIe slots, chipsets, and various onboard peripherals, except for the CPU, which has a separate dedicated power connector. This connector, often a 24-pin or 20-pin arrangement, distributes the necessary voltage levels (typically 3.3V, 5V, and 12V) needed for the operation of these components.

In contrast, the case fan power connector is specifically designed to connect and power system fans, and it does not supply power to other motherboard components. A USB header port is used for connecting USB ports to the motherboard, allowing for additional external device connections but does not provide power to the other components. Lastly, the power LED connector is intended for connecting status indicators, which visually represent whether the system is powered on; therefore, it does not contribute to supplying power to the operational components in the system.