v Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
v If an action step is preceded by “(Trained technician only),” that step must be performed only by a trained
technician.
v Go to the IBM support website at http://www.ibm.com/supportportal/ to check for technical information, hints,
tips, and new device drivers or to submit a request for information.
Symptom Action
The Pwr rail M error has been
recorded in the system event
log.
1. Disconnect the server power cords.
2. Remove the following components if the Pwr rail M error has been recorded in
the system event log:
v Optional PCI adaptor power cable-correlated PCI adaptor
v PCI Riser Card Assembly where the optional PCI adaptor power
cable-correlated PCI adaptor is installed
v Optional PCI adaptor power cable (if one is present)
3. Restart the server. If the Pwr rail M error has been recorded in the system
event log again, (trained technician only) replace the system board (see
“Removing the system board” on page 276 and “Replacing the system board”
on page 279).
4. Reinstall the components one at a time, in the order shown, restarting the
server each time. If the Pwr rail M error has been recorded in the system event
log again, the component that you just reinstalled is defective. Replace the
defective component.
v Optional PCI adaptor power cable (if one is present)
v PCI Riser Card Assembly where the optional PCI adaptor power
cable-correlated PCI adaptor is installed
v Optional PCI adaptor power cable-correlated PCI adaptor
The server does not turn off.
1. Determine whether you are using an Advanced Configuration and Power
Interface (ACPI) or a non-ACPI operating system. If you are using a non-ACPI
operating system, complete the following steps:
a. Press Ctrl+Alt+Delete.
b. Turn off the server by pressing the power-control button and hold it down
for 5 seconds.
c. Restart the server.
d. If the server fails POST and the power-control button does not work,
disconnect the power cord for 20 seconds; then, reconnect the power cord
and restart the server.
2. If the problem remains or if you are using an ACPI-aware operating system,
suspect the system board.
The server unexpectedly shuts
down, and the LEDs on the
operator information panel are
not lit.
See “Solving undetermined problems” on page 115.
108 System x3650 M5 Type 5462: Installation and Service Guide
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