The following table describes the problems that are indicated by various
combinations of the power-supply LEDs and suggested actions to correct the
detected problems.
Table 11. Power-supply LEDs
AC Power-supply LEDs
Description Action NotesAC DC Error
On On Off Normal
operation
Off Off Off No ac power to
the server or a
problem with the
ac power source.
1. Check the ac power to the server.
2. Make sure that the power cord is
connected to a functioning power
source.
3. Restart the server. If the error remains,
check the power-supply LEDs.
4. If the problem remains, replace the
power-supply.
This is a normal
condition when no
ac power is present.
On Off Off Faulty system
board or faulty
power supply
1. Turn off the server and disconnect the
power cord from the server; then,
reconnect the power cord.
2. If the system board error (fault) LED
is not lit, replace the power supply.
3. (Trained technician only) If the system
board error LED is lit, replace the
system board.
Typically indicates
that a power supply
is not fully seated.
This is a normal
condition before
turning on the
system.
Video
Serial (Com1)
Ethernet
connector 2
USB connectors
AC Power LED (green)
DC power LED (green)
Fault (error)LED (yellow)
Power connectors
Ethernet transmit/
receive activity LED
Ethernet link
status LED
Ethernet
connector 1
Figure 72. LEDs and connectors on the rear of the 5U server model with hot-swap power
supplies
Chapter 4. Troubleshooting 131
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