IBM LS20 - BladeCenter - 8850, Service Manual, Page: 47 / 116

Monitor or video problems
Some IBM monitors have their own self-tests. If you suspect a problem with your
monitor, see the documentation that comes with the monitor for instructions for
testing and adjusting the monitor. If you cannot diagnose the problem, call for
service.
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 Action
The screen is blank.
1. Make sure that:
v The keyboard/mouse/video select button LED on the front of the blade
server is lit, indicating that the blade server is connected to the shared
BladeCenter monitor.
v
The system power cord is plugged into the BladeCenter power module and a
working electrical outlet.
v
The monitor cables are connected properly.
v The monitor is turned on and the Brightness and Contrast controls are
adjusted correctly.
v
Damaged BIOS code is not affecting the video; see “Recovering from a
BIOS update failure” on page 49.
Important: In some memory configurations, the 3-3-3 beep code might sound
during POST followed by a blank display screen. If this occurs and the Boot
Fail Count feature in the Start Options of the Configuration/Setup Utility
program is set to Enabled (its default setting), you must restart the blade
server three times to force the system BIOS to reset the CMOS values to the
default configuration (memory connector or bank of connectors enabled).
2. If you have verified these items and the screen remains blank, replace:
a. Monitor
b. Management module on the BladeCenter unit (see the Hardware
Maintenance Manual and Troubleshooting Guide or Problem Determination
and Service Guide for your BladeCenter unit type).
Only the cursor appears. Make sure that the keyboard, video and mouse on the BladeCenter have not been
switched to another blade server. If the problem remains, see“Solving
undetermined problems” on page 50.
The monitor goes blank when
you direct it to a working blade
server, or goes blank when you
start some application programs
in the blade servers. Make sure that the monitor cable is connected to the video port on the
BladeCenter management module. Some IBM monitors have their own self-tests. If
you suspect a problem with the monitor, see the information that comes with the
monitor for adjusting and testing instructions.
If you still cannot find the problem, try using the monitor with another blade server.
If the problem remains, see the
Hardware Maintenance Manual and
Troubleshooting Guide or Problem Determination and Service Guide for your
BladeCenter unit type.
Chapter 2. Diagnostics
33