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, and the reset button
does work (the server does not
start).
Note: The power-control button
will not function until 20
seconds after the server has
been connected to power.
1. Make sure that:
v The power cords are correctly connected to the server and to a working
power source.
Attention: In a dc power environment, only trained service personnel
other than IBM service technicians are authorized to connect or disconnect
power to the dc power supply. See the documentation that comes with each
dc power supply.
v The type of memory that is installed is correct.
v The LEDs on the power supply do not indicate a problem.
v The microprocessors are installed in the correct sequence.
2.
Make sure that the power-control button and the reset button are working
correctly:
Attention: In a dc power environment, only trained service personnel other
than IBM service technicians are authorized to connect or disconnect power to
the dc power supply. See the documentation that comes with each dc power
supply.
a. Disconnect the server power cords.
b. Reseat the operator information panel assembly cable.
c. Reconnect the power cords.
d. Press the power-control button to restart the server. If the button does not
work, replace the operator information panel assembly.
e. Press the reset button (on the light path diagnostics panel) to restart the
server. If the button does not work, replace the operator information panel
assembly.
3.
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.
4. Reseat the power backplane and restart the server.
5. Replace the power backplane and restart the server.
6. Replace the following components one at a time, in the order shown, restarting
the server each time:
a. Power supplies
Attention: In a dc power environment, only trained service personnel
other than IBM service technicians are authorized to connect or disconnect
power to the dc power supply and to remove and install the dc power
supply. See the documentation that comes with each dc power supply.
b. (Trained service technician only) System board
7.
See “Solving power problems” and “Solving undetermined problems” in the
Problem Determination and Service Guide.
Chapter 5. Solving problems 71
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