Monitor problems

Some Lenovo monitors have their own self-tests. If you suspect a problem with your monitor, see the documentation that comes with the monitor for instructions for testing and adjusting the monitor. If you cannot diagnose the problem, call for service.

Table 1. Monitor and video symptoms and actions.

The monitor and video symptoms and actions table with one level of row and column headers.

Symptom Action
Testing the monitor.
  1. Make sure that the monitor cables are firmly connected.
  2. Try using a different monitor on the server, or try using the monitor that is being tested on a different server.
  3. Run the diagnostic programs. If the monitor passes the diagnostic programs, the problem might be caused by a video device driver.
  4. (Trained technician only) Replace the system board.
The screen is blank.
  1. If the server is attached to a KVM switch, bypass the KVM switch to eliminate it as a possible cause of the problem: connect the monitor cable directly to the correct connector on the rear of the server.
  2. Make sure that:
    • The server is turned on. If there is no power to the server, see Power problems.
    • The monitor cables are connected correctly.
    • The monitor is turned on and the brightness and contrast controls are adjusted correctly.
    • No POST errors are generated when the server is turned on.
  3. Make sure that the correct server is controlling the monitor, if applicable.
  4. Make sure that damaged server firmware is not affecting the video. See Updating the firmware.
  5. Observe the checkpoint LEDs on the system board; if the codes are changing, go to the next step.
  6. Replace the following components one at a time, in the order shown, restarting the server each time:
    1. Monitor
    2. Video adapter (if one is installed)
    3. (Trained technician only) System board
The monitor works when you turn on the server, but the screen goes blank when you start some application programs.
  1. Make sure that:
    • The application program is not setting a display mode that is higher than the capability of the monitor.
    • You installed the necessary device drivers for the application.
  2. Run video diagnostics. See Running DSA Preboot diagnostic program.
    • If the server passes the video diagnostics, the video is good. Then, you can refer to Solving undetermined problems.
    • (Trained technician only) If the server fails the video diagnostics, replace the system board.
The monitor has screen jitter, or the screen image is wavy, unreadable, rolling, or distorted.
  1. If the monitor self-tests show that the monitor is working properly, consider the location of the monitor. Magnetic fields around other devices (such as transformers, appliances, fluorescents, and other monitors) can cause screen jitter or wavy, unreadable, rolling, or distorted screen images. If this happens, turn off the monitor.
    Attention: Moving a color monitor while it is turned on might cause screen discoloration.

    Move the device and the monitor at least 305 mm (12 inches) apart, and turn on the monitor.

    Note: Non-Lenovo monitor cables might cause unpredictable problems.
  2. Reseat the monitor and cable.
  3. Replace the following components one at a time, in the order shown, restarting the server each time:
    1. Monitor
    2. (Trained technician only) System board
Wrong characters appear on the screen.
  1. If the wrong language is displayed, update the server firmware to the latest level (see Updating the firmware) with the correct language.
  2. Reseat the monitor and cable.
  3. Replace the following components one at a time, in the order shown, restarting the server each time:
    1. Monitor
    2. (Trained technician only) System board