Asus RAMPAGE IV BLACK EDITION - Manual (Page 46)

1-30 Chapter 1: Product introduction
Chapter 1
3. MemOK! LED
Blinking: Indicates that MemOK! is enabled before POST.
4. Q LED
Q LEDs check key components (CPU, DRAM, VGA card, and booting devices) in
sequence during motherboard booting process. If an error is found , the corresponding
LED will continue lighting until the problem is solved. This user-friendly design provides
an intuitive way to locate the root problem within seconds.
For more information about the MEMOK_LED and DRAM_LED, see the MemOK! button on
section 1.2.6 Onboard buttons and switches.