How to Troubleshoot a Computer Monitor

Computer monitor problems can be the result of a number of culprits, including electrical and cabling issues, interference, a problem with the computer's video adapter or drivers or a problem with the monitor itself. Use the following tips to help diagnose problems you may be having with your monitor.

Difficulty: Moderately Easy

Instructions

1. Check for loose electrical and VGA cables. Remove the electric cord from the back of the monitor, then put it back in place. Remove the VGA cable from the computer and monitor and put it back in place. Make sure the connection is tight. If you're using a cable extender, remove it.

2. Plug the monitor's electric cord into a different outlet. If you're using a UPS or surge protector, plug it directly into a wall outlet.

3. Attach the monitor to a different computer. If the monitor still doesn't work, replace the monitor's cable. Make sure the cable is less than 5 feet long. If it still doesn't work, the monitor will need to be replaced or repaired. If it works with no problem on the other computer, troubleshoot your video card.

4. Unplug your computer from the monitor and power outlet. Remove the cover. Pull the video card out of the slot on the system board. Push it back into place. Be sure the connection is secure.

5. Put the CD that came with your video card into your computer's CD-ROM drive. Follow the directions to reinstall the video card drivers. Download a new version of the drivers from the manufacturer's website if necessary.

6. Right-click a blank area of your Desktop. Choose "Properties" from the display menu. Click the "Settings" tab. Try different screen resolutions to resolve the problem.

7. Determine whether the problem is caused by electrical interference. Electrical interference will make the monitor appear jumpy or wavy. Move any speakers, radios, fans or other items that can cause electrical interference away from the monitor.

Tips & Warnings

• Monitors use high voltage and should never be opened while plugged into an outlet. If your monitor is faulty, have it examined and repaired by an authorized technician.

[prhalcomb]

on 10/5/2009 I recently had my computer rebuilt, had it back for 1 day and now my monitor has no display. It will come up briefly with no vga signal and then the monitor will say it is going to sleep. The screen is black. I have checked the connections and unpluged the computer. nothing. Help

[boll17084]

on 8/15/2009 I have an older KDS monitor, The screen is pulling in from the middle on the sides, is this a computor prob or monitor prob and if so how can it be fixed than kyou

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[garry323]

on 1/27/2009 I have a 17" CTX flat-screen monitor.When I first turn my computer on,the monitor will flick on for a second and then off for a second,back and forth for about 5 minutes.Once it "warms up",it will then stay on.Does anyone know what the problem might be?