IBM System Storage DS3300, Installation, User'S, And Maintenance Manual

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Power-supply LEDs
This section describes the primary LEDs on the DS3300 power supplies.
DC power LED (green)
When this green LED is lit, it indicates that the DS3300 is turned on and is
supplying both 5-volt and 12-volt dc power to the DS3300.
OK to remove LED (blue)
When this blue LED is lit, it indicates that it is safe to remove the
power-supply unit.
Fault LED (amber)
When this amber LED is lit, it indicates that a power supply or fan has
failed or that a redundant power supply is not turned on.
AC power LED (green)
When this green LED is lit, it indicates that the DS3300 is receiving ac
power.
Fault LED (amber)
AC power LED (green)
OK to remove LED (blue)
DC power LED (green)
Figure 31. Power-supply LEDs
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System Storage DS3300 Storage Subsystem: Installation, User’s, and Maintenance Guide