1.4 Before you proceed Asus prime Asus M3A78-EM

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ASUS M3A78-EM

1-9

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. 

1.4 

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.

•  Use a grounded wrist strap or touch a safely grounded object or a metal 

object, such as the power supply case, before handling components 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, ensure that the ATX power 

supply is switched off or the power cord is detached from the power 

supply. Failure to do so may cause severe damage to the motherboard, 

peripherals, and/or components.

M3A78-EM Onboard LED

R

M3A78-EM

SB_PWR

ON

Standby

Power

OFF

Powered

Off