- If model-specific information is required to complete any of the steps in this solution, refer to the operating instructions supplied with the product. Manuals are posted on your model support page.
- This procedure must be performed while logged in as Administrator or to an account with Administrator rights.
- Some monitors must be turned on after the computer is turned on.
- Degauss the monitor by turning the monitor off, waiting a few seconds, and then turning the monitor back on.
- This may need to be done several times before a degauss is successful.
- Some monitors may require up to 20 minutes between degaussing for an optimal effect.
- Reset the monitor to factory defaults.
- Configure the monitor in VGA Mode.
- Verify the correct monitor resolution is selected in Display Properties.
NOTE: If the monitor is a CRT (Cathode Ray Tube), it may be necessary to adjust the monitor refresh rate to eliminate flicker.
- Ensure the color depth is at least High Color 16bit.
- Remove any large electrical devices or speakers from the vicinity of the computer.
NOTE: This includes devices plugged into the same power strip as the monitor.
- If using a CRT (Cathode Ray Tube) monitor, turn off any fluorescent lighting.
- Disconnect and reconnect the monitor to the computer, ensuring there are no bent pins or broken connectors.
- If using an available BNC connection for the monitor, ensure the 5 BNC connectors are in the proper order, red, green, blue, horizontal synchronization, and vertical synchronization.
- For monitors which support both a BNC and a HD15 connection, ensure the monitor is configured to use the current connection type.
- For monitors using both an analog and a digital connection, use only one connection type to the computer.
- Wiggle the video cable where it connects to the monitor to ensure the cable does not have a short. If this causes the problem to go away and then come back, the monitor may need to be serviced.
NOTE: If a video pass-through card is used, bypass the video pass-through connection and connect from the monitor directly to the video card. If the problem is resolved the video pass-through connection may need to be replaced. Contact the manufacturer of the video pass-through hardware.
- Remove any video extension cables.
- If available, perform a monitor self-test to ensure the monitor is functioning correctly.
- Try the monitor in a different room. If successful, suspect an EMI (Electromagnetic Interference) or AC voltage problems in the original room. A line conditioner can be purchased from a local retailer to help resolve voltage problems.
NOTE: A line conditioner is not guaranteed to resolve this issue.
- Try the monitor on a different computer.
- Perform a system restore to a time when the computer was functioning properly.
- Restore the video drivers.