DFI G5C100-NR - Manual (Page 60)

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Hardware Installation
DRAM Power LED
This LED will turn red when the system’s power is on or when it is
in the Suspend state (Power On Suspend or Suspend to RAM). It
will not light when the system is in the Soft-Off state.
Standby Power LED
This LED will turn red when the system is in the power-on, Soft-Off
or Suspend (Power On Suspend or Suspend to RAM) state.
Important:
If the DRAM Power LED or Standby Power LED is lighted, you
must power-off the system then turn off the power supply’s
switch or unplug the power cord prior to installing any memory
modules or add-in cards.
DRAM Power LED and Standby Power LED
DRAM
Power LED
Standby
Power LED