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The SIO chip confirms standby power is stable and sends a Resume Reset signal to the PCH/Southbridge.
Once the PCH gives permission, the EC turns on the primary power: desktop motherboard power sequence pdf
The power sequence of a modern desktop motherboard (x86/Intel/AMD architecture) follows a precise chronological order to prevent hardware damage and ensure proper system initialization. The SIO chip confirms standby power is stable
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: Once the main power is on, the Voltage Regulator Modules (VRMs) convert the 12V supply into lower, precise voltages needed for the CPU core and graphics.
The SIO chip sends this 3.3V signal to the Southbridge to tell it that the standby power is stable and it's ready to wake up. 2. The Trigger: Pressing the Power Button
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