DFI NP900-B16C - Manual (Page 22)

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2
Hardware Installation
LEDs
DRAM Power LED
This LED will light when the system’s power is on.
Standby Power LED
This LED will light when the system is in the standby mode.
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.
Standby
Power LED
DRAM
Power LED
DRAM/Standby Power LED