Question: I want to turn off the LED while the system is off. Where can I find the setting?(7/1/2021) Answer: Please follow the steps below and set the "Turn on Onboard LED in S5” setting to disabled under the BIOS.
While the system is starting, press hotkey "F2” or "Del” repeatedly to enter BIOS setup.
Disable the "Turn On Onboard LED in S5” under the BIOS.
AMD platform: Advanced\Onboard Devices Configuration\Turn On Onboard LED in S5\Disabled
Intel platform: Advanced\Chipset Configuraiton\Turn on Onboard LED in S5\Disabled