Asus RS726Q-E7/RS12 - Manual (Page 72)

4-20 Chapter 4: Motherboard information
3. Standby Power LED (SB_PWR1)
The motherboard comes with a standby power LED. The green LED lights up to
indicate that the system is ON, in sleep mode, or in soft-off mode. This is a reminder
that you should shut down the system and unplug the power cable before removing
or plugging in any motherboard component. The illustration below shows the location
of the onboard LED.