DFI COM630-B - Manual (Page 40)

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Hardware Installation
Standby Power LED
Standby
Power LED
Diagnostic LED
Standby Power LED
This LED will lit red when the system is in the standby mode. It indicates that
there is power on the system board. Power-off the PC then unplug the power
cord prior to installing any devices. Failure to do so will cause severe damage to
the motherboard and components.
Diagnostic LED
The Diagnostic LED displays POST codes. POST (Power-On Self Tests) which is
controlled by the BIOS is performed whenever you power-on the system. POST
will detect the status of the system and its components. Each code displayed on
the LED corresponds to a certain system status.