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: The user presses the physical power button on the PC case.
If you need to narrow down a specific issue, I can help you understand: What to measure if the motherboard doesn't turn on at all. How to identify if the CPU is receiving power. desktop motherboard power sequence pdf exclusive
Before you ever press the power button, two supplies are already active: : The user presses the physical power button on the PC case
The primary transitions are G3 → S5 → S0 for startup, and S0 → S3/S4/S5 for sleep or shutdown states. "I am stable. You may proceed."
The power sequence relies heavily on handshakes—signals sent from one chip to another to say, "I am stable. You may proceed."