ThinkPad P50 User Manual page 116

12. Select the correct manufacturer and model for the external display. If you cannot find your monitor on
the list, stop the installation of this driver and use the driver shipped with your monitor.
13. After updating the driver, click Close.
• Problem: The screen is unreadable or distorted.
Solution: Make sure that:
– The monitor information is correct and the appropriate monitor type is selected. Refer to the solution to
the above problem.
– Make sure that an appropriate refresh rate is selected by doing the following:
1. Connect the external display to the monitor connector, and then connect the monitor to an
electrical outlet.
2. Turn on the external display and the computer.
3. Right-click on the desktop, and do the following:
– For Windows 7: Click Screen resolution.
– For Windows 10: Click Display settings ➙ Advanced display settings.
Note: If your computer cannot detect the external display, click the Detect button.
4. Click the icon for the desired monitor (the Monitor-2 icon is for the external display).
5. Do the following:
– For Windows 7: Click Advanced settings.
– For Windows 10: Click Display adapter properties.
6. Click the Monitor tab.
7. Select the correct screen refresh rate.
• Problem: Wrong characters are displayed on the screen.
Solution: Did you follow the correct procedure when installing the operating system or program? If you
did, have the external display serviced.
• Problem: The Extend desktop function does not work.
Solution: Press the display-mode switching key
• Problem: If you use the Extend desktop function, you cannot set a higher resolution or higher refresh rate
on the secondary display.
Solution: Change the resolution and the color depth to lower settings for the primary display.
• Problem: Display switching does not work.
Solution: If you use the Extend desktop function, disable it, and change the display output location. If a
DVD movie or a video clip is playing, stop the playback, close the program, and then change the display
output location.
• Problem: The screen position on the external display is incorrect when that monitor is set for a high
resolution.
Solution: Sometimes, when you use a high resolution, the image is shifted to left or right on the screen. To
correct this, first make sure that your external display supports the display mode (the resolution and the
refresh rate) that you have set. If it does not, set a display mode that the monitor supports. If it does
support the display mode you have set, go to the setup menu for the monitor itself and adjust the settings
there. Usually the external display has buttons for access to the setup menu. For details, see the
documentation that comes with the monitor.
• Problem: DVI monitor cannot be recognized.
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P50 User Guide
to select the Extend desktop function.