Network Connection Problems - Lenovo BladeCenter HS23 7875 Problem Determination And Service Manual

• See Chapter 3 "Parts listing" on page 29 to determine which components are consumable, structural, or CRU
parts.
• If an action step is preceded by "(Trained technician only)," that step must be performed only by a trained
technician.
Symptom
The screen is blank.
The monitor has screen jitter,
or the screen image is wavy,
unreadable, rolling, or
distorted.
Wrong characters appear on
the screen.

Network connection problems

Use this information to diagnose and resolve network connection errors.
IBM updates the support website with the latest tips and techniques that you can use to resolve any
problems. Go to the BladeCenter support search website at http://www.ibm.com/supportportal/ to see if any
service bulletins have been generated. In the Search field, type 7875, retain tip, and chassis.
Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved. The blade server connects to the network by using shared BladeCenter unit resources. See the
following table and "Solving shared BladeCenter resource problems" on page 258.
Action
1. Check the function of the shared BladeCenter unit resources (see "Solving
shared BladeCenter resource problems" on page 258).
2. Make sure that the blade server is turned on (see "Turning on the blade server"
on page 6).
3. Make sure that the monitor is connected properly. See the documentation for
your BladeCenter unit for more information.
4. Make sure that:
• Damaged BIOS code is not affecting the video; see "Recovering from a UEFI
update failure" on page 254.
• The device drivers are installed correctly.
5. (Trained technician only) Replace the system-board assembly (see "Removing
the system-board assembly" on page 71 and "Installing the system-board
assembly" on page 71).
1. Check the function of the shared BladeCenter unit resources (see "Solving
shared BladeCenter resource problems" on page 258).
2. (Trained technician only) Replace the system-board assembly (see "Removing
the system-board assembly" on page 71 and "Installing the system-board
assembly" on page 71).
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. Check the function of the shared BladeCenter unit resources (see "Solving
shared BladeCenter resource problems" on page 258).
3. (Trained technician only) Replace the system-board assembly (see "Removing
the system-board assembly" on page 71 and "Installing the system-board
assembly" on page 71).
. 193
Chapter 5 Diagnostics