Note: The device driver name depends on the video chip that has been installed on your computer.5. Click the Colour Management tab, and then click the Colour Management button. In the displayedColour Management window, click the Advanced tab and ensure that the settings in the WindowsColour System Defaults area are set as desired. If you are prompted for an administrator passwordor confirmation, type the password or provide confirmation.• Problem: Incorrect characters are displayed on the screen.Solution: Did you install the operating system or application program correctly? If they are installed andconfigured correctly, have the computer serviced.• Problem: The screen stays on even after you turn off your computer.Solution: Press and hold the power button for four seconds or more to turn off your computer; thenturn it on again.• Problem: Missing, discolored, or bright dots appear on the screen every time you turn on your computer.Solution: This is an intrinsic characteristic of the TFT technology. Your computer display containsmultiple thin-film transistors (TFTs). A small number of missing, discolored, or bright dots on the screenmight exist all the time.External monitor problems• Problem: The external monitor is blank.Solution: To bring up the image, press F7 and select the desired monitor. If the problem persists, dothe following:1. Connect the external monitor to another computer to ensure that it works.2. Reconnect the external monitor to your computer.3. Refer to the manual shipped with the external monitor to check the resolutions and refresh rates thatare 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 theexternal 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: You cannot set a higher resolution than the present one on your external monitor.Solution: Make sure that the monitor type and other information is correct. If necessary, update themonitor driver. See “Setting the external monitor type” on page 47.• Problem: The screen is unreadable or distorted.Solution: Ensure that:– The monitor information is correct and the appropriate monitor type is selected. Refer to the solutionto the above problem.– Ensure that an appropriate refresh rate is selected by doing the following:1. Connect the external monitor to the monitor connector, and then connect the monitor to anelectrical outlet.2. Turn on the external monitor and the computer.3. Right-click on the desktop, and click Screen resolution.Note: If your computer cannot detect the external monitor, click the Detect button.Chapter 9. Troubleshooting computer problems 107