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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 Hardware Maintenance Manual 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 Lenovo 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 Lenovo 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 Lenovo 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
Hardware Maintenance Manual.
74 ThinkServer RD120 Types 6444, 6445, 6446, and 6447: Installation Guide