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Table 3. Power-supply LEDs
AC power
Off
Off
Off
Off
On
On
On
On
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 integrated
management module (IMM) is shut down; however, the server can respond to
requests from the IMM, 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.
Turning on the server
Approximately 20 seconds 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 start the operating system by pressing the power-control button.
The server can also be turned on in any of the following ways:
18
IBM System x3400 M3 Type 7378/7379: Installation and User's Guide
Power-supply LEDs
DC power
Power error
Off
Off
On
On
Off
Off or flashing
On
On
Description
Off
No AC power to the server or a problem
with the AC power source
On
No AC power to the server or a problem
with the AC power source and the power
supply has detected an internal problem
Off
Faulty power supply
On
Faulty power supply
Off
Power supply not fully seated, faulty
system board, or faulty power supply
On
Faulty power supply
Off
Normal operation
On
Power supply is faulty but still operational
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