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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 which are computer
screen, external monitor, audio, and optical drive. Check these topics to learn more information.
Computer screen problems
• Problem: The screen is blank.
Solution: Do the following:
– Press Fn+F7 to bring up the image.
Note: If you use the Fn+F7 key combination to apply a presentation scheme, press Fn+F7 at least
three times in three seconds, and the image is displayed on the computer screen.
– If you are using the ac power adapter, or using the battery and the battery status indicator is on (is
green), press Fn+Home to make the screen brighter.
– If the sleep (standby) status indicator is on (is green), press Fn to resume from the sleep (standby) mode.
– If the problem persists, do the Solution in the problem below.
Note: If your computer is a Windows 7 model, it does not support the presentation scheme.
• Problem: The screen is unreadable or distorted.
Chapter 10. Troubleshooting computer problems 215