Power problems
v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See the parts listing in the Problem Determination and Service Guide to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by “(Trained service technician only),” that step must be performed only by a
trained service technician.
Symptom Action
The power-control button does
not work (the server does not
start).
Note: The power-control button
will not function until 20
seconds after the server has
been connected to ac power.
1. Make sure that the control-panel assembly power-control button is working
correctly:
a. Disconnect the server power cords.
b. Reconnect the power cords.
c. Press the power-control button. If the server do not start, check the
power-control button for damage.
2.
Make sure that:
v The power cords are correctly connected to the server and to a working
electrical outlet.
v The power LEDs (AC, DC) are lit correctly.
v The server contains the correct type of DIMMs.
v The DIMMs are correctly seated.
v A POST beep code did not sound, indicating a memory initialization error.
v The LEDs on the power supply do not indicate a problem.
v The microprocessor is correctly installed.
3.
Reseat the following components:
a. DIMMs
b. Power supply cables to all internal components
c. Power supplies (hot-swap models)
4.
Replace the following components one at a time, in the order shown, restarting
the server each time:
a. DIMMs
b. Power supplies (hot-swap models)
c. (Trained service technician only) Power supply (non-hot swap models)
5.
If you just installed an optional device, remove it, and restart the server. If the
server now starts, you might have installed more devices than the power supply
supports.
6. See “Solving undetermined problems” in the Problem Determination and
Service Guide on the IBM System x3400 Documentation CD.
The server does not turn off.
1. Determine whether you are using an Advanced Configuration and Power
Management (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 holding the power-control button for 5 seconds.
c. Restart the server.
d. If the server fails POST and the power-control button does not work,
disconnect the ac power cord for 20 seconds; then, reconnect the ac power
cord and restart the server.
2.
(Trained service technician only) If the problem remains or if you are using an
ACPI-aware operating system, suspect the system board.
88 System x3400 Types 7973, 7974, 7975, and 7976: Installation Guide
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