IBM IntelliStation M Pro 6225 Hardware Maintenance Manual And Troubleshooting Manual page 101

Monitor problems
Symptom
The screen is blank.
Only the cursor appears.
The monitor works when you
turn on the computer, but the
screen goes blank when you
start some application
programs.
The monitor has screen jitter, or
the screen image is wavy,
unreadable, rolling, or distorted.
FRU/action
1. Make sure that:
v The computer power cord is connected to the computer and a working
electrical outlet.
v The monitor cables are connected correctly.
v The monitor is turned on and the brightness and contrast controls are
adjusted correctly.
v If the computers are C2T chained together, verify that:
– The C2T chain cables are securely connected to the computers.
– The C2T breakout cable is connected correctly.
– The selected computer is turned on.
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 computer three
times to force the BIOS to reset the configuration settings to the default
configuration (memory connector or bank of connectors enabled).
2. Make sure that damaged BIOS code is not affecting the video; see "Recovering
from a POST/BIOS update failure" on page 23.
3. If the problem remains, replace:
a. Monitor
b. Video adapter, if installed
c. System board
See "Undetermined problems" on page 102
1. Make sure that:
v The application program is not setting a display mode higher than the
capability of the monitor.
v The primary monitor cable is connected to the C2T breakout cable.
v You have installed the necessary device drivers for the application programs.
2. If the problem remains, replace the monitor.
3. Video adapter.
4. System board.
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,
and turn on the monitor.
Notes:
a. To prevent diskette drive read/write errors, make sure that the distance
between the monitor and diskette drives is at least 76 mm (3 in.).
b. Non-IBM monitor cables might cause unpredictable problems.
c. 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.
2. Monitor.
3. Video adapter, if installed.
4. System board.
Chapter 6. Symptom-to-FRU index
91