Dell POWEREDGE R710 - Manual (Page 21)

About Your System
21
Power Indicator Codes
An LED indicator on the power button indicates when power is supplied to
the system and the system is operational.
Redundant power supplies have an indicator that shows whether power is
present or whether a power fault has occurred.
• Not lit — AC power is not connected.
• Green — In standby mode, indicates that a valid AC source is connected
to the power supply and that the power supply is operational. When the
system is on, also indicates that the power supply is providing DC power to
the system.
• Amber — Indicates a problem with the power supply.
• Alternating green and amber — When hot-adding a power supply,
indicates that the power supply is mismatched with the other power
supply (a High Output 870-W power supply and an Energy Smart 570-W
power supply are installed in the same system). Replace the power supply
that has the flashing indicator with a power supply that matches the
capacity of the other installed power supply.
CAUTION:
When correcting a power supply mismatch, replace only the power
supply with the flashing indicator. Swapping the opposite power supply to make a
matched pair can result in an error condition and unexpected system shutdown. To
change from a High Output configuration to an Energy Smart configuration or vice
versa, you must power down the system.