Table 5. Power-supply LEDs (continued)
Power-supply LEDs
Description Action NotesAC DC Error
On Off Off Power supply
not fully seated,
faulty system
board, or faulty
power supply
1. Reseat the power supply.
2. If the system-board error LED is off,
replace the power supply.
3. (Trained service technician only) If the
system-board error LED is lit, replace
the system board.
This typically
indicates that a
power supply is not
fully seated.
On Off or
Flashing
On Faulty power
supply
Replace the power supply.
On On Off Normal
operation
On On On Power supply is
faulty but still
operational
Replace the power supply.
Server power features
This topic provides guidelines for server power features.
When the server is connected to an ac power source but is not turned on, the
operating system does not run, and all core logic except for the service processor is
shut down; however, the server can respond to requests from the service processor,
such as a remote request to turn on the server. The power-on LED flashes to
indicate that the server is connected to ac power but not turned on.
In a two-node configuration, connect both servers to an ac power source as close to
the same time as possible to ensure optimum operation.
Turning on the server
This topic provides instructions for how to turn on the server.
A scaled system takes longer to power-on then a stand alone system.
Approximately 30 seconds for a stand alone server, or up to 8 minutes in a 2-node
configuration, after the server is connected to ac power, the power-control button
becomes active, and one or more fans might start running to provide cooling while
the server is connected to power. You can turn on the server and all nodes in the
partition and start the operating system by pressing the power-control button.
Note: Do not power the server off when b:b/0:0 is flashing on the front panel.
This indicates that setup/configuration is in process.
If you are restarting a two-node server after it has been turned off, you must allow
extra time for the hardware to synchronize before you turn on the server again.
The server can also be turned on in any of the following ways:
v If a power failure occurs while the server is turned on, the server will restart
automatically when power is restored.
v The systems-management software can turn on the server remotely.
v If your operating system supports the Wake on LAN feature, the Wake on LAN
feature can turn on the server.
20 IBM System x3850 X5 and x3950 X5 Types 7145, 7146, 7143, and 7191: Problem Determination and Service Guide
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