Lenovo ThinkServer RD120 Hardware Maintenance Manual page 174

v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 3, "Parts listing, ThinkServer RD120 Machine Types 6444, 6445, 6446, and 6447," on page 25
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
The power-control button does
not work, and the reset 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 power.
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ThinkServer RD120 server Machine Types 6444, 6445, 6446, and 6447: Hardware Maintenance Manual
Action
1. Make sure that:
v The power cords are correctly connected to the server and to a working
electrical outlet.
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 (see
"Power-supply LEDs" on page 167).
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 Easy LED 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. Hot-swap 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 install and remove 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" on page 192.
8. See "Solving undetermined problems" on page 194.