I have Windows 8.1 installed on two machines with ASRock H87M Pro4 motherboards, USB keyboards, and PS/2 mice, and both show this behavior:
When I initiate a shutdown, Windows responds with "Shutting down" and when it's done there are no lights on the PC, but the optical mouse is still lit, and left-clicking the mouse ordinarily starts the computer.
Does anyone know if this is an ASRock or Windows feature, what it's called, and how to control it?
I understand that a PS2_USB_PWR1 mobo jumper setting can cause this behavior, but that jumper or similar does not exist on this board.
BIOS: Advanced: ACPI is set thus:
Suspend to RAM: Auto
Check Ready Bit: Enabled
ACPI HPET Table: Enabled
PS/2 Keyboard Power On: Disabled
PCI Devices Power On: Disabled
Wake From Onboard LAN: Disabled
Ring-In Power On: Disabled
RTC Alarm Power On: By OS [perhaps related to MS InstantGo support?]
USB Keyboard/Remote Power On: Disabled
USB Mouse Power On: Disabled
Other settings of interest in BIOS: Advanced: Chipset Configuration:
Onboard HD Audio: On/Off Play: Disabled already
Deep Sleep: Disabled already
Good Night LED: Auto/Enabled/Disabled (all settings failed to fix)
So I'm not seeing anything above that looks to me like it should cause this behavior.