External Monitor Problems - Lenovo ThinkPad T570 User Manual

4. Click the Monitor tab. Check the monitor information to make sure that the monitor type is correct. If
it is, click OK to close the window; otherwise proceed with the following steps.
5. If more than two monitor types are displayed, select Generic PnP Monitor or Generic Non-PnP
Monitor.
6. Click Properties. If you are prompted for an administrator password or confirmation, type the
password or provide confirmation.
7. Click the Driver tab.
8. Click Update Driver.
9. Click Browse my computer for driver software, and then click Let me pick from a list of device
drivers on my computer.
10. Clear the Show compatible hardware check box.
11. Select the correct manufacturer and model for the external monitor. If you cannot find your monitor
on the list, stop the installation of this driver and use the driver shipped with your monitor.
12. After updating the driver, click Close.
• Problem: Incorrect characters are displayed on the screen.
Solution: Ensure that you install the operating system and program correctly. If the problem persists,
have the computer serviced.
• Problem: I try to turn off my computer but the screen stays on and I cannot completely turn off my
computer.
Solution: Press and hold the power button for four seconds or more to turn off the computer.
• Problem: Missing, discolored, or bright dots appear on the screen every time I turn on my computer.
Solution: This is an intrinsic characteristic of the TFT technology. Your computer display contains
multiple thin-film transistors (TFTs). Only a very small number of missing, discolored, or bright dots
on the screen might exist all the time.

External monitor problems

• Problem: The external monitor is blank.
Solution: To bring up the image, press the display-mode switching key
want. If the problem persists, do the following:
1. Connect the external monitor to another computer to ensure that it works.
2. Reconnect the external monitor to your computer.
3. See the manual shipped with the external monitor to check the resolutions and refresh rates that
are supported.
– If the external monitor supports the same resolution as the computer display or a higher resolution,
view output on the external monitor or on both the external monitor and the computer display.
– If the external monitor supports a lower resolution than the computer display, view output on the
external monitor only. (If you view output on both the computer display and the external monitor,
the external monitor screen will be blank or distorted.)
• Problem: I cannot set a higher resolution than the present one on my external monitor.
Solution: Ensure that the monitor information is correct. If necessary, update the monitor driver.
• Problem: The screen is unreadable or distorted.
Solution: Ensure that:
– The monitor information is correct and the appropriate monitor type is selected. If necessary, update
the monitor driver.
and select the monitor you
.
Chapter 7 Troubleshooting computer problems
95