PS-ON and ACPI states are different things. You could fully shutdown an ATX system without ACPI 1.0 https://electronics.stackexchange.com/questions/204205/what

PS-ON and ACPI states are different things. You could fully shutdown an ATX system without ACPI 1.0 https://electronics.stackexchange.com/questions/204205/what-is-required-to-activate-the-ps-on-on-the-motherboard-to-power-on-a-compu https://electronics.stackexchange.com/questions/204205/what-...