Lenovo ThinkServer RD120 Hardware Maintenance Manual page 153

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.
No-beep symptom
No beeps occur, and the
server operates correctly.
No beeps occur after
successful completion of
POST.
No beeps occur, and
there is no video.
No beep occurs, and the
power-supply ac LED is
off
No beep occurs, the
server does not start,
and the power-supply ac
LED is lit.
Description
Possible problem with the operator
information panel.
The power-on status is Disabled.
Unknown problem.
Possible power problem.
Possible power problem.
Action
1. Check the operator information panel cable
for damage.
2. Reseat the operator information panel
cable.
3. Replace the following components, one at a
time, in the order shown, restarting the
server each time:
a. (Trained service technician only)
Operator information panel
b. (Trained service technician only) System
board
1. Run the Configuration/Setup Utility program
and select Start Options; then, set
Power-On Status to Enable.
2. Check the operator information panel cable
for damage.
3. Reseat the operator information panel
cable.
4. (Trained service technician only) Replace
the system board
See "Solving undetermined problems" on page
194.
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 a dc power supply. See the
documentation that comes with each dc power
supply.
1. Make sure that the power cord is connected
to the power supply and to a power source.
2. Reseat the power supplies.
3. If two power supplies are installed, swap
them to determine whether one is defective.
4. Disconnect the cable from the hard disk
drive backplane power connector (J13) on
the power backplane. If the ac power LED
comes on, see "Solving undetermined
problems" on page 194.
See "Power-supply LEDs" on page 167.
Chapter 5. Diagnostics
135