Dell E14S Series Owner's Manual page 18

Figure 7. DC power supply unit status indicator
1. DC power supply unit status indicator
Table 10. DC power indicator
Convention Power indicator
pattern
A Green
B Flashing green
C Flashing amber
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Condition
The handle/LED indicator lights green indicating that a valid power
source is connected to the power supply unit and that the power
supply unit is operational.
When hot-adding a power supply unit, power supply unit LED
flashes green. This indicates that the power supply unit is
mismatched with the other power supply unit (in terms of
efficiency, feature set, health status, and supported voltage).
Replace the power supply unit that has the flashing indicator with a
power supply unit that matches the capacity of the other installed
power supply unit.
Indicates a problem with the power supply unit.
CAUTION: When correcting a power supply unit mismatch,
replace only the power supply unit with the flashing
indicator. Swapping the opposite power supply unit to make
a matched pair can result in an error condition and
unexpected system shutdown. To change from a High
Output configuration to a Low Output configuration or vice
versa, you must power down the system.