Onboard LED Asus prime Asus M3A78

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Before you proceed

Take note of the following precautions before you install motherboard components or change 

any motherboard settings.

•  Unplug the power cord from the wall socket before touching any component.
•  Before handling components, use a grounded wrist strap or touch a safely grounded 

object or a metal object, such as the power supply case, to avoid damaging them due to 

static electricity.

•  Hold components by the edges to avoid touching the ICs on them.
•  Whenever you uninstall any component, place it on a grounded antistatic pad or in the 

bag that came with the component.

•  Before you install or remove any component, switch off the ATX power supply and 

detach its power cord. Failure to do so may cause severe damage to the motherboard, 

peripherals, or components.

Onboard LED

The motherboard comes with a standby power LED that lights up to indicate that the system 

is ON, in sleep mode, or in soft-off mode. This is a reminder that you should shut down 

the system and unplug the power cable before removing or plugging in any motherboard 

component. The illustration below shows the location of the onboard LED.

M3A78

R

M3A78

M3A78 Onboard LED

R

M3A78

SB_PWR

ON

Standby

Power

OFF

Powered

Off

Chapter 1: Product introduction

1-5