Asus RS320Q-E7 RS12 User Manual page 63

3. P8BH +5V Power LED (+5V_LED)
This LED lights up when you turn on the system using the Power-on button.
4. Location LED (LOC_LED)
This LED lights up for you to conveniently locate the system in error.
ASUS RS320Q-E7/RS12 4-15