Asus Rampage IV Formula - Manual (Page 44)

2-20 Chapter 2: Hardware information
Chapter 2
4. GO LED
Blinking: Indicates that MemOK! is enabled before POST.
Lighting: Indicates that the system loads the preset profile (GO_Button file) for
temporary overclocking when in OS.
5. 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 intuitional way to locate the root problem within a second.