Monitor Problems - Lenovo ThinkCentre 3512 Manual

Action: Erratic movement of the mouse pointer is generally caused by a buildup of dirt, oils, and other
contaminants on the ball inside the mouse. Clean the mouse.
The fingerprint reader does not work
Symptom: The fingerprint reader does not work.
Action: The following could cause the fingerprint reader not to operate properly:
• Not enrolling your fingerprint correctly.
• Scratching the surface of the reader with a hard, pointed object.
• Scraping the surface of the reader with your nail or anything hard.
• Using or touching the reader with a dirty finger.
• The surface of your finger is very different from when you enrolled your fingerprint.
The wireless keyboard does not work
Symptom: The wireless keyboard does not work.
Action: If the Transceiver Communications LED is on and the wireless Keyboard does not work, restart your
computer. If restarting your computer does not solve the problem, verify that the following conditions are met:
• The batteries are properly installed.
• The batteries still retain their current.
• The wireless keyboard is located less than ten meters away from the transceiver.
• The transceiver is fully installed.
Action: If the transceiver communications LED is not on, reconnect the transceiver and the keyboard.

Monitor problems

Note: Many monitors have status-indicator lights and built-in controls for adjusting brightness, contrast,
width, height, and other picture adjustments. However, the controls vary from monitor type to monitor type.
Select your symptom from the following list:
• "Wrong characters appear on the screen" on page 43
• "The monitor works when you turn on the computer, but goes blank after some period of computer
inactivity" on page 43
• "The monitor works when you turn on the computer, but goes blank when you start some application
programs" on page 44
• "The image appears to be flickering" on page 44
• "The image is discolored" on page 44
Wrong characters appear on the screen
Symptom: Wrong characters appear on the screen.
Action: Have the computer serviced. For details, see "Additional information resources" on page 31.
The monitor works when you turn on the computer, but goes blank after some period
of computer inactivity
Symptom: The monitor works when you turn on the computer, but goes blank after some period of computer
inactivity.
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Chapter 5 Troubleshooting and diagnostics
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