How to Diagnose Computer Video Problems
If your computer has any problems with its video display, there's pretty much nothing you can use the computer for until you fix it. There are three areas that can lead to problems with your computer's video output. It could lie in the computer video card that produces the video images, the monitor that displays them or the cables connecting the monitor to the computer. Some problems, however, can often be solved by adjusting the brightness or resolution levels. When diagnosing video problems, start with the simplest areas and move your way up.
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Instructions
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Make sure the monitor's brightness and contrast buttons aren't turned all the way down if you have a black monitor screen.
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Reboot the computer a couple of times to ensure the system isn't locked up.
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3
Check both cords connected to the monitor--the power cord and data cable--and make sure they have no broken or bent connectors or pins. Replace them if needed. If they look good but you still suspect them, replace them with any spare cables you have and know are good.
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4
Swap out the monitor if you have an old one that you know still works. This will make certain if the monitor is the problem or not.
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Inspect the computer's video card if you know the monitor works but have no picture. Make sure the card is properly seated if your computer mounts it in an adapter slot. If it's mounted to the motherboard, make sure no jumpers are loose or missing.
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Adjust the monitor's resolution if you get a poor display. Right-click on an open area on your desktop and choose "Properties." In the "Display Properties" dialog box, go to the "Settings" tab and change the resolution with the slider.
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Optimize your monitor's refresh rate. Click on the "Advanced" button in the "Display Properties Settings" tab and select the "Monitor" tab. Look over your monitor's manual to find out it's maximum refresh rate---it is often around 70 Hertz.
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Tips & Warnings
Clean your computer's casing to keep air flowing and all parts, including the video card, cool. Look for updates to your device drivers and software patches to improve the video card's performances. Check software websites whose products support your brand of air card and operating system.
