Display And Multimedia Devices - Lenovo ThinkPad L420 User Manual

– When the computer resumes normal operation.
– When the TrackPoint is pressed for a long time.
– When the temperature changes
• Problem: The TrackPoint or touch pad does not work.
Solution: Make sure that the TrackPoint or touch pad is set to Enabled in the UltraNav Device Setting.
Note: To open the UltraNav Device Setting, press Fn+F8.
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, external keyboard,
making sure that you have seated the connectors properly.
If the problem remains, make sure that the correct device driver is installed.
For Windows 7:
1. Click Start ➙ Control Panel. Change the view of the Control Panel from Category to Large icons
or Small icons.
2. Click Keyboard.
3. Select the Hardware tab. In the Device Properties, make sure that the Device Status is This device
is working properly.
For Windows Vista:
1. Click Start ➙ Control Panel.
2. Click Hardware and Sound, and then click Keyboard.
3. Select the Hardware tab. In the Device Properties, make sure that the Device Status is This device
is working properly.
For Windows XP:
1. Click Start ➙ Control Panel.
2. Click Printers and Other Hardware, and then click Keyboard.
3. Select the Hardware tab. In the In the Device Properties, make sure that the Device Status is This
device is working properly.
If keys on the keyboard still do not work, have the computer serviced.
• Problem: A number appears when you type a letter.
Solution: The numeric lock function is on. To disable it, press Shift+ScrLk or Fn+NmLk.
• Problem: All or some keys on the external numeric keypad do not work.
Solution: Make sure that the external numeric keypad is correctly connected to the computer.

Display and multimedia devices

This section includes the most common display and multimedia devices problems.
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User Guide