Lenovo 20JW, User Manual, Page: 109 / 176

– When the TrackPoint pointing device is kept pressed for a long time
– When the temperature changes
• Problem : The TrackPoint pointing device or trackpad does not work.
Solution : Ensure that the TrackPoint pointing device or trackpad is enabled in the Mouse Properties
window. For more information, see “Customizing the ThinkPad pointing device” on page 24.
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.
If the problem persists, ensure that the correct device driver is installed by doing the following:
1. Go to Control Panel, and then 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, make sure 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.
Computer screen problems
• Problem : My screen keeps blanking when I do not want it to.
Solution :
– If your computer is preinstalled with the Windows 7 operating system, you can disable any system
timers, such as the LCD turn-off timer or the blank timer by doing the following:
1. Start the Power Manager program. See “Accessing Lenovo programs” on page 12.
2. Click the Power plan tab, and then select Maximum Performance from the predefined power
plans.
– If your computer is preinstalled with the Windows 10 operating system, do the following:
1. Go to Control Panel, and ensure that you view Control Panel by Category.
2. Click Hardware and Sound ➙ Power Options .
3. Show the additional plans, and then select High performance .
• Problem : When I turn on the computer, nothing is displayed on the screen and the computer does not
beep while starting up.
Note: If you are not sure whether you heard any beeps, turn off the computer by pressing and holding the
power button for four seconds or more. Then turn on the computer and listen again.
Solution : Ensure that:
– The battery is installed correctly.
– The ac power adapter is connected to the computer and the power cord is plugged into a working
electrical outlet.
Chapter 7
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Troubleshooting computer problems
93