- If a thin, gray horizontal line is visible on the monitor, additional information is available .
- Because each of these steps can be a possible resolution for display issues, check the display function after completing each step.
- When connecting a monitor to an Apple® Macintosh® computer, ensure the proper the MacAdapter and settings are being used.
- If using a third-party video adapter, contact the video adapter manufacturer for the proper switch settings.
- Turn the monitor off, wait twenty to thirty seconds, then turn the monitor back on. This will degauss the monitor.
- Degaussing is the process of removing magnetism from the monitor. This magnetism is created by external magnetic forces, such as the earths natural magnetism, electronic or magnetic devices placed close to the monitor, and even flouescent lighting.
- This process may need to be repeated several times to completely degauss the monitor.
- Ensure the monitor cables are correctly connected .
- Remove any monitor extension cables.
- If using the AC adapter, disconnect the AC adapter from any power strip or surge protector and connect it directly into a wall outlet.
NOTE: If this eliminates the display issues then the problem lies with the power strip or surge protector. Contact the manufacturer of the power strip or surge protector device for further assistance.
- Remove any magnetic devices, electrical devices, speakers, lamps or fans from the vicinity of the computer.
- Remove any devices connected to the same wall outlet or electrical circuit as the monitor.
- Turn off any florescent lighting in the vicinity of the computer.
NOTE: Electrical devices and florescent lighting produce an invisible field of electromagnetism that cause an effect called Electromagnetic Interference (EMI). The display elements in both Cathode Ray Tube (CRT) and Liquid Crystal Display (LCD) monitors use precisely calibrated components that can be adversely affected by EMI. Moving such devices away from the monitor will minimize the affects of EMI.
- Reset the monitor to the factory default settings.
- Perform a monitor self test.
- Wiggle the cable where it connects to the monitor.
NOTE: If wiggling the cable causes the problem to go away and then come back, the cable may be damaged or have an electrical short, or the connector on the monitor is faulty.
- If a video pass-through card is being used, bypass the video pass-through connection and connect the monitor directly to the video card.
NOTE: If this eliminates the display issues then the problem lies with the video pass-through device. Contact the manufacturer of the video pass-through device for further assistance.
- Move the computer and monitor to a different room.
NOTE: If this eliminates the display issues then an EMI or AC voltage problem exists in the original room. A line conditioner may help, but is not guaranteed to resolve voltage problems.
- Connect the monitor to a different computer.
NOTE: If this eliminates the display issues then a software or video card problem exists on the original computer.
- Replace the monitor cable being used with a different cable.
- If the display problems persist after replacing the cable, the connector on the monitor is faulty and service will be required to resolve the issue.