The Chipset releases the platform reset, allowing PCIe slots, network chips, and the SIO to begin operating normally.
The SIO receives the high SLP_S3# signal. It immediately pulls the signal (the green wire on your ATX 24-pin connector) down to 0V (Ground) .
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The SIO reads its basic configuration firmware and enters a listening state, waiting for user interaction. 2. The Power Button Trigger ( PWRBTN# )
) to the motherboard, indicating that the main voltages are safe.
Desktop Motherboard Power Sequence: A Deep-Dive Technical Guide
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: Powers hard drives, solid-state drives, USB ports, and logic circuits.
The VRM switches high-current +12V phases down to the exact micro-volt requirements of the CPU core ( VCORE ), graphics core ( VAXG ), and internal ring buses.
For complex boards, consider measuring start‑up with a current‑limited bench supply and a very slow voltage ramp to detect shorts before any rail is fully powered.
Power supply fan does not turn on when motherboard is triggered. Failed SIO or short circuit on main rails. VCORE 0.8 V - 1.4 V Fans spin at maximum speed; no display; CPU remains cold. Shorted CPU VRM Mosfets / Dead PWM Controller. 8 PLTRST# / CPURST#