Acer Altos R510 manual Description

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Item	Description
System	Solid blue indicates system identification is active
Identification	No light indicates system identification is not activated
LED

Note: If the system is powered down without going through the BIOS, the

LED state that was in effect at the time of the power-down is restored when the system is powered back on or until the BIOS clears the LED. If the system is not powered down normally, the Power LED may blink and the System Status LED may be off due to a failure or configuration change that prevents the BIOS from running.

Note: After you press the Service ID button, the Service ID LED will blink 15 times and turn off automatically. You can only turn it off through ASM 6.0.