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Fading on and off: The server is in a reduced-power state. To wake the server, press the power-
control button or use the IMM web interface. See
information on logging on to the IMM web interface.
• System-locator LED: Use this LED to visually locate the server among other servers. You can use IBM
Systems Director to light this LED remotely.
Power-supply LEDs
Use this information to view power-supply LEDs.
The following minimum configuration is required for the server to start:
• One microprocessor in microprocessor socket 1
• One 2 GB DIMM for each microprocessor installed (one 2 GB DIMM in slot 3 if only one microprocessor
installed)
• One power supply
• Power cord
• Five cooling fans (fan 1, 2, 3, 4, and 5)
• One PCI riser-card assembly in PCI connector 2
• One ServeRAID SAS/SATA controller
AC power-supply LEDs
Use this information to view AC power-supply LEDs.
The following illustration shows the location of the AC power-supply LEDs on the rear of the server. See the
Problem Determination and Service Guide for additional information about solving power-supply problems.
Figure 12. AC power-supply LEDs
The following table describes the problems that are indicated by various combinations of the power-supply
LEDs on an ac power supply and suggested actions to correct the detected problems.
AC power-supply LEDs
Error (!)
AC
DC
On
On
Off
Off
Description
Off
Normal operation
Off
No ac power to the
server or a
problem with the
ac power source.
"Logging on to the Web interface" on page 116
Action
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. Replace the power-supply.
.
Chapter 1
The Lenovo System x3550 M3 server
for
Notes
This is a normal
condition when no ac
power is present.
27
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