Asus P9X79-E WS - Manual (Page 39)

2.2.7 Onboard LEDs
1. Diagnosis LED
These diagnosis LEDs of CPU, DRAM, VGA card, and HDD indicate key component
status during POST (Power-on Self Test), providing an elegant embellishment to the
motherboard design. The LED lights will flash sequentially during system bootup. If an
error is found, the LED next to the error device will continue lighting until the problem is
solved. This user-friendly design provides an intuitional way to locate the root problem
in seconds.
2. EPU LED
The EPU LED lights when the EPU switch is turned to Enable.
ASUS P9X79-E WS 2-15