Lenovo NeXtScale nx360 M5 Installation And Service Manual page 87

• Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
• If an action step is preceded by "(Trained technician only)," that step must be performed only by a trained
technician.
• Go to the Lenovo support website at http://www.lenovo.com/support to check for technical information,
hints, tips, and new device drivers or to submit a request for information.
Symptom
The monitor works when you
turn on the server, 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.
Wrong characters appear on
the screen.
Action
1. Make sure that:
• The application program is not setting a display mode that is higher than the
capability of the monitor.
• You installed the necessary device drivers for the application.
2. Run video diagnostics (see "Running DSA Preboot diagnostic programs" on
page 65).
• If the server passes the video diagnostics, the video is good; see "Solving
undetermined problems" on page 80.
• (Trained technician only) If the server fails the video diagnostics, replace the
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, fluorescents, 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 any external diskette drive is at least 76 mm (3 in.).
b. Non-Lenovo monitor cables might cause unpredictable problems.
2. Reseat the monitor cable.
3. Replace the components listed in step 2 one at a time, in the order shown,
restarting the server each time:
a. Monitor cable
b. Video adapter (if one is installed)
c. Monitor
d. (Trained technician only) System board.
1. If the wrong language is displayed, update the server firmware to the latest level
(see "Updating the firmware" on page 31) with the correct language.
2. Reseat the monitor cable.
3. Replace the components listed in step 2 one at a time, in the order shown,
restarting the server each time:
a. Monitor cable
b. Video adapter (if one is installed)
c. Monitor
.
Chapter 4 Troubleshooting
73