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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 Chapter 3, "Parts listing, Type 7981," on page 53 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 monitor has screen jitter, or
the screen image is wavy,
unreadable, rolling, or distorted.
Wrong characters appear on the
screen.
Network connection 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 Chapter 3, "Parts listing, Type 7981," on page 53 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
One or more blade servers are
unable to communicate with the
network.
32
BladeCenter HS20 Type 7981: Problem Determination and Service Guide
Action
1. If the monitor self-tests show that the monitor is working correctly, consider the
location of the monitor. Magnetic fields around other devices (such as
transformers, appliances, fluorescent lights, and other monitors) can cause
screen jitter or wavy, unreadable, rolling, or distorted screen images. If this
happens, turn off the monitor.
Attention:
Moving a color monitor while it is turned on might cause screen
discoloration.
Move the device and the monitor at least 305 mm (12 in.) apart. Turn on the
monitor.
Notes:
a. To prevent diskette drive read/write errors, make sure that the distance
between the monitor and any diskette drive is at least 76 mm (3 in.).
b. Non-IBM monitor cables might cause unpredictable problems.
2. Replace the monitor.
3. Replace the management-module in the BladeCenter unit (see the Hardware
Maintenance Manual and Troubleshooting Guide or Problem Determination and
Service Guide for your BladeCenter unit).
4. (Trained service technician only) Replace the system board assembly.
1. If the wrong language is displayed, update the firmware or operating system
with the correct language in the blade server that has ownership of the monitor.
2. Replace the monitor.
3. (Trained service technician only) Replace the system board assembly.
Action
Make sure that:
v The switch modules for the network interface that is being used are installed in
the correct BladeCenter bays and are configured and operating correctly. See
the Hardware Maintenance Manual and Troubleshooting Guide or Problem
Determination and Service Guide for your BladeCenter unit for details.
v The settings in the switch module are correct for the blade server (settings in the
switch module are specific to each blade server).
If the problem remains, see "Solving undetermined problems" on page 49.
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