Asus Rampage IV Formula - Manual (Page 45)

ROG RAMPAGE IV FORMULA 2-21
Chapter 2
6. Power LED
The motherboard comes with a power-on switch that 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
power-on switch.
7. Debug LEDs
The Debug LED design provides you the 2-digit display, allowing you to know the
system status. Refer to the Debug table below for details.