ASUS Z170-PRO Manuel D’Utilisation

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Chapter 1: Product Introduction
Chapter 1
1.2.8 
Onboard LEDs
1. 
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.
2. 
Power LED (PWR_LED)
 
This LED lights up when the system is on.