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Monitor problems
Note: The monitor screen remains blank until it is directed to a blade server that is
Symptom
The monitor screen goes
blank when you direct it to a
working blade server, or it
goes blank when you start
some application programs in
the blade servers.
The screen is blank.
Only the cursor appears.
The monitor has screen jitter,
or the screen image is wavy,
unreadable, rolling, or
distorted.
60
Eserver BladeCenter HS20 Type 8843: Installation and User's Guide
turned on; this is normal behavior.
Suggested action
Make sure that the monitor cable is connected to the video connector on the
management module. Some IBM monitors have their own self-tests. If you suspect a
problem with your 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 for your BladeCenter unit type.
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 monitor.
v The BladeCenter unit power cord is connected to the 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.
Important: In some memory configurations, the 3-3-3 beep code might sound during
POST followed by a blank monitor screen. If this occurs and the Boot Fail Count
feature in the Start Options of the Configuration/Setup Utility program is enabled (its
default setting), you must restart the blade server three times to force the system
BIOS to reset the configuration settings to the default configuration (the memory
connector or bank of connectors enabled).
If the problem remains, call for service.
Make sure that the keyboard, video, and mouse on the BladeCenter unit have not
been switched to another blade server.
If the problem remains, call for service.
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 300 mm (12 in.) apart, and turn on the
monitor.
Notes:
1. To prevent diskette drive read/write errors, make sure that the distance between
the monitor and diskette drives is at least 75 mm (3 in.).
2. Non-IBM monitor cables might cause unpredictable problems.
3. An enhanced monitor cable with additional shielding is available for the 9521 and
9527 monitors. For information about the enhanced monitor cable, contact your
IBM marketing representative or authorized reseller.
If the problem remains, call for service.
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