Asus P8Z68-V PRO/GEN3 - Manual (Page 36)

2-18 Chapter 2: Hardware information
Chapter 2
2.2.6 Onboard LEDs
1. POST State LEDs
The POST State LEDs of CPU, DRAM, VGA card, and HDD indicate key components
status during POST (Power-on Self Test). 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 within a second.