DFI PM10-EC User Manual page 17

1.3.15 DIMM and PCI Standby Power LEDs
PCI Standby
Power LED
DIMM Standby 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.
PCI 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:
Lighted LEDs serve as a reminder that 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.
Quick Setup Guide
DIMM Standby
Power LED
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