Network Connection Problems - IBM LS20 - BladeCenter - 8850 Service Manual

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 8850," 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 screen is wavy, unreadable,
rolling, distorted, or has screen
jitter.
Wrong characters appear on the
screen.
No video.

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 8850," 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.
34
AMD Opteron LS20 Type 8850 for IBM BladeCenter: Problem Determination and Service Guide
Action
1. If the monitor self-tests show the monitor is working properly, 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. (Moving a color monitor while it is turned on
might cause screen discoloration.) Then 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, be sure the distance between
monitors and diskette drives is at least 76 mm (3 in.).
b. Non-IBM monitor cables might cause unpredictable problems.
2. Replace the monitor.
3. (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.
1. Make sure that the correct blade server is selected, if applicable.
2. Make sure that all cables are fastened securely.
Action
Make sure that:
v The switch modules for the network interface 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 type for details.
v The settings in the switch module are appropriate for the blade server (settings
in the switch module are blade-specific).
If the problem remains, see "Solving undetermined problems" on page 50.