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The South Bridge responds by releasing these "Sleep" signals, telling the SIO it is okay to wake the system fully.

This is the "story" of a desktop motherboard coming to life, following the strict technical Desktop Motherboard Power Sequence Part 1: The Standby Vigil (S5 State) desktop motherboard power sequence pdf exclusive

The PSON# signal connects to the ATX PSU Green Wire. When this wire is grounded (Low), the PSU wakes up. The South Bridge responds by releasing these "Sleep"