Справочник Пользователя для ASUS Z97-AR

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Chapter 1: Product introduction
1.8 
Onboard LEDs
1. 
Standby Power 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 any 
motherboard components. The illustration below shows the location of the onboard 
LED.
2. 
POST State LEDs
The POST State LEDs provide the status of these key components during POST 
(Power-On-Self Test): CPU, memory modules, VGA card, and hard disk drives. If an 
error is found, the critical component’s LED stays lit up until the problem is solved.