Asus MAXIMUS IV EXTREME-Z User Manual page 54

5. BIOS LED
The BIOS LEDs help indicate the BIOS activity. Press the BIOS button
to switch between BIOS1 and BIOS2 and the LED lights up when the
corresponding BIOS is in use.
6. 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.
2-22 Chapter 2: Hardware information