Troubleshooting
External Monitor Problems
Problem
Action
The screen is blank.
Verify that:
The power cord for the external monitor is plugged into a working electrical
outlet and into the external monitor.
The external monitor is turned on and the brightness and contrast controls
are adjusted.
The signal cable for the external monitor is plugged into the external-monitor
connector on the computer. Some signal cables might not fit into the
external-monitor connector because of the connector type.
The external monitor (CRT
or Both
) is selected as the display
device using the Fn key function (see page 26) or the ThinkPad Features
program (see page 33).
After verifying the preceding items, turn off the computer; then turn it on.
If the external monitor remains blank, run the display tests described in the
instructions supplied with the external monitor. If the tests show the external
display is OK, have the computer serviced.
The screen is unreadable
or distorted.
Verify that:
The ThinkPad display driver is installed correctly (see Chapter 7).
The device setup parameters in the display setting screen (click on the
Display (
) icon in the ThinkPad Features program) are set to your
display resolution and color type (see page 46).
To change or set up the external monitor, see “Attaching a Monitor” on page 45.
If these are correct, run the tests described in the instructions supplied with the
external monitor. If the tests show the external display is OK, have the
computer serviced.
Wrong characters appear
on the screen.
Verify that the operating systems and application programs have been installed
and configured correctly.
If so, have the computer serviced.
Chapter 8. Solving Computer Problems
207
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