Dell PowerEdge T410 Hardware Owner's Manual page 25

Figure 1-7. Non-Redundant Power Supply Status Indicator
1 power supply test switch
• Not lit — AC power is not connected.
• Green — In standby mode, a green light indicates that a valid AC source is
connected to the power supply and that the power supply is operational.
When the system is on, a green light also indicates that the power supply is
providing DC power to the system.
2 power supply status
About Your System
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