Problems With The Display And Multimedia Devices - Lenovo ThinkPad P40 Yoga User Manual

Solution: Ensure that the TrackPoint pointing device or ThinkPad trackpad is enabled in the ThinkPad
pointing device setting window.
Keyboard problems
• Problem: All or some keys on the keyboard do not work.
Solution: If an external numeric keypad is connected:
1. Turn off the computer.
2. Remove the external numeric keypad.
3. Turn on the computer and try using the keyboard again.
If the keyboard problem is resolved, carefully reconnect the external numeric keypad and the external
keyboard. Ensure that you have seated the connectors correctly.
If the problem persists, ensure that the correct device driver is installed by doing the following:
1. Open Control Panel. Change the view of Control Panel from Category to Large icons or Small icons.
2. Click Keyboard.
3. Select the Hardware tab. In the Device Properties pane, ensure that you see this message: Device
Status: This device is working properly.
If keys on the keyboard still do not work, have the computer serviced.
• Problem: All or some keys on the external numeric keypad do not work.
Solution: Ensure that the external numeric keypad is correctly connected to the computer.

Problems with the display and multimedia devices

This topic includes the most common problems with displays and multimedia devices, including the
computer display, the external monitor, and audio devices.
Computer screen problems
• Problem: The screen is blank.
Solution: Do the following:
– Press the display mode-switching key
– If you are using the ac power adapter, or using the battery and the battery gauge shows that the battery
is not depleted, press the brightness-up key
– If your computer is in sleep mode, press Fn to resume from the sleep mode.
– If the problem persists, follow the solution for the following problem.
• Problem: Incorrect characters are displayed on the screen.
Solution: Did you install the operating system or application program correctly? If they are installed and
configured 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; then
turn 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 contains
multiple thin-film transistors (TFTs). A small number of missing, discolored, or bright dots on the screen
might exist all the time.
to bring up the image.
to make the screen brighter.
.
Chapter 8 Troubleshooting computer problems
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