How to Trouble Shoot Video Problems on a Laptop Computer
If your laptop's display isn't working, don't throw away your computer without doing a few simple checks first. Video problems are usually caused by the video card (built into the motherboard on most laptops) or the display unit. Of course, make sure the computer is on before diagnosing it as a video problem! Here are a few things to try.
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Instructions
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Plug in an external monitor that you know works. On most laptops, you need to press the function (Fn) key and another key (often F8) to direct the video output to an external monitor.
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Check the LCD cutoff switch. Sometimes the combination function + F8 will disable the screen, and you can do it without realizing it at the time. Try toggling the combination a few times, waiting a few seconds between each press of the toggle key to let the display power up. Most laptops have three display states: LCD only, external only and both.
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Raise or lower the brightness level. This is usually done with a function key combination as well, such as function+F5 or function+F6. Check your keyboard for function keys that look like the Sun.
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If you have a handheld computer, try turning the backlight feature on or off. For specifics on how to do this, check your manual. If the display is not working, you can order a new one from the laptop manufacturer. If the computer won’t output a display to an external monitor as well, you likely need a new motherboard.
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Check the hard disk drive indicator and try powering the computer down with the combination of Control-Alt-Delete, then rebooting after a short pause.
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Tips & Warnings
Keep your computer's manual (if you have one) in a secure place where you can find it if you need it. It can often answer many questions for you.
