Troubleshooting your HP laptop's screen requires testing a number of laptop components and looking for common problems that may be afflicting your HP device. Sometimes, power issues or simply monitor brightness settings may be adversely affecting your display. Other times, however, you must run tests that gauge whether your HP laptop monitor has completely shut down or if your motherboard is in error. Fortunately, any do-it-yourself type can perform these tests with an external monitor and VGA cable on hand.
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Things you need
- External monitor
- VGA cable
Make sure the AC adaptor is correctly hooked up to both your HP laptop and the wall socket or surge protector (whichever is applicable). The AC adaptor for your HP laptop may have come loose from either of these points, resulting in a power failure that you may have attributed to a disabled monitor. Also, plug the adaptor into a different wall socket, just in case the current outlet is blown.
Check your HP laptop battery. Batteries deteriorate as they age, and each battery is on average good for roughly 1,000 charges. After that, they begin to become unable to hold a charge. Observe the battery light indicator on the side of your HP laptop to see if the battery may be the issue.
Consider the brightness settings for your HP laptop monitor. The monitor's brightness may accidentally be turned all the way down, to the extent that the monitor appears completely dark. Find the monitor brightness keys on your HP's keyboard, which will reside directly above the numeric keys along the top row of the keyboard. Adjust the monitor's brightness as necessary.
Look closely at your HP laptop monitor. Is there a very faint image on it, but it appears to otherwise be dark and the monitor brightness has been adjusted. Find the "LCD closed switch," which is a small switch directly by the monitor's hinges. This switch acts as a sensor that normally knows when the laptop is open or shut. It may have got stuck in the closed position. Tap the switch vigorously with your finger to jar it loose and back to the open position.
Connect your HP laptop monitor to an external monitor to perform a display test. Use a VGA cable to do so. This test will determine whether your HP laptop monitor has completely failed and needs to be replaced, or if the issue lies with the motherboard. With the laptop and external monitor connected by the VGA cable, turn on both and wait to see if the external monitor displays the HP laptop's information correctly. If so, your HP monitor itself is at fault. If the external monitor does not display any information, though, your problem lies with the laptop's motherboard.
Tips and warnings
- If your motherboard has failed, replace your laptop entirely. Motherboards are too costly to justify their individual replacement.
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