IBM NetVista X40 User Manual page 107

Table 4. Troubleshooting charts (continued)
Device
Wavy, unreadable, rolling,
distorted screen, or screen jitter.
Wrong characters appear on the
screen.
Option
An IBM option that was just
installed does not work.
An IBM option that used to
work does not work now.
Parallel port
The number of parallel ports
displayed is less than the
number of parallel ports
installed.
Suggested action
If the monitor self-tests show the monitor is OK, 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. (Moving a
color monitor while it is turned on might cause screen discoloration.) Then move
the device and the monitor at least 305 mm. (12 in.) apart. Turn on the monitor.
Notes:
1. To prevent diskette drive read/write errors, be sure the distance between
monitors and diskette drives is at least 76 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, see
your IBM reseller or IBM marketing representative.
If the problem remains, call for service.
If the wrong language is displayed, update the BIOS with the correct language.
If the problem remains, call for service.
Verify that:
1. The option is designed for the computer. Refer to the "Computer Support"
flowchart for information about obtaining options compatibility information
from the World Wide Web.
2. You followed the installation instructions that came with the option.
3. The option is installed correctly.
4. You have not loosened any other installed options or cables.
5. You updated the configuration information in the Configuration/Setup Utility
program. Whenever memory or an option is changed, you must update the
configuration.
If the problem remains, call for service.
Verify that all of the option hardware and cable connections are secure.
If the option comes with its own test instructions, use those instructions to test the
option.
If the failing option is a SCSI option, verify that:
1. The cables for all external SCSI options are connected correctly.
2. The last option in each SCSI chain, or the end of the SCSI cable, is terminated
correctly.
3. Any external SCSI option is turned on. You must turn on an external SCSI
option before turning on the system.
If the problem remains, call for service.
Verify that:
1. Each port is assigned a unique address.
2. The parallel-port adapter, if you installed one, is seated properly.
If the problem remains, call for service.
Chapter 6. Solving problems
91