Asus RAMPAGE IV EXTREME User Manual page 47

2. Hard Disk LED
The hard disk LED is designed to indicate the hard disk activity. It blinks when data
is being written into or read from the hard disk drive. The LED does not light up when
there is no hard disk drive connected to the motherboard or when the hard disk drive
does not function.
3. 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.
ROG RAMPAGE IV EXTREME 2-23