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This document is describes how to troubleshoot a video connection from a display or a TV being used as a display to a personal computer.
This problemi BPH helps you determine if the blank or black screen is being caused by the computer hardware, the video signal problemi BPH the display, or the display itself. Before you begin Do the problemi BPH things to prepare for troubleshooting:. Disconnect all connected devices from the computer except the mouse, and keyboard. This includes removing web cameras, USB devices, thumb drives, camera-type memory cards, and other displays.
If the problemi BPH has a detachable cable, obtain a second display cable for testing purposes. Disconnect the display power cable, wait about 30 seconds, reconnect the cable and then turn on the display. This resets the electronics on the display. Make sure the display has power and the power light comes on when the power button is pressed.
If the light on the display remains off, the display is not receiving power from either the wall outlet or the power adapter. Check the power Disconnect the video problemi BPH from the display and make sure the display power cable is plugged into a power outlet. With the display plugged in, press the power button on the display. There is a power indicator light located on the display case. What happens to the light? If the power light comes onthe display has power, skip to Listen to the computer and look at the lights.
If power light remains off when you press the power button, either the problemi BPH is not problemi BPH power or problemi BPH display is defective.
Check all of the problemi BPH items before attempting to service or replace the display:. Make sure the power outlet has power and the power outlet matches the problemi BPH rating for the problemi BPH. Listen to the computer and look at the lights To help determine problemi BPH the problem is caused by the computer, turn on the computer and listen to it. Look at the computer's lights. What do you notice? If the computer is make a beeping sound when turned on, a card, cable, memory module, or processor inside the computer might be problemi BPH.
Go to Reseat loose internal components to check for loose components. Do you hear the computer's fan spinning? If you do not hear noise from the fans and the power light on the computer are not on, the problem is related to the computer, not the display. If problemi BPH can hear the computer's fan spin and see lights on the computer, the problem is probably caused by the video cable connection or the display.
Continue to the next section. Reset the display At first setup, or under certain signal problemi BPH, the display might not be able to switch to a new display resolution. Do not shut down or restart the computer. Instead, perform the following steps:. You should see the image from the computer on the screen. If not, continue with the troubleshooting. On-screen message shows on the display Use the following steps to see if a built-in on-screen message is displayed.
If a message is displayed, the display panel is working and the problem is related to the video signal. If the display remains blank, turn off the computer and continue troubleshooting.
Some displays do not have on-screen messages but instead use the lights to indicate no signal. When you disconnect the cable, instead of an on-screen message, the light turns amberindicating that the display lost signal and is working problemi BPH, but is out of range, or not receiving the signal. Inspect the video cable and video connectors for damage Inspect the video cable and video connectors for damage.
Check for sharp bends or breaks in the cable, or bent or broken pins at the connectors. Look for debris, dirt, crud, or other obstructions and clean the connections if needed. Reconnect the display, making sure that the video cable is firmly connected and then turn on the computer and display. If the display is still blank, continue to the next section. Do not remove the video port cover If your computer came with a graphics card, HP may have installed a plastic cover over the video port attached to the motherboard.
This is because video has been set up to go through the graphics card for better performance. Most PCs can use graphics from the video card or the motherboard, but not both at the same time. The better solution is to connect an adapter to make problemi BPH connection.
Check cable connections If you see the initial HP problemi BPH Compaq problemi BPH screen but later lose the picture, problemi BPH to Connect problemi BPH computer to problemi BPH display. Otherwise, check problemi BPH video cable connection on the problemi BPH of the computer and on the display.
Make sure that it is connected properly and the connecting screws are tight. Turn the display off and then back on again while the computer is on to see if an image gets displayed. Ensure that you have the display power adapter cord plugged into the power connector. After you have reconnected the power cord, turn on the display while the computer is on to see if an image is displayed. Problemi BPH there is still no image, continue to the next section.
Connect the computer to another display Connect another display to the computer problemi BPH determine which device has the problem the display or the computer.
If you do not have an extra display, temporarily connect the computer to a friend's display for troubleshooting purposes. After the display is connected, turn on the computer and the problemi BPH. What happens? If the newly attached display problemi BPH not display anythingdisconnect the cable and refer to the support document HP Guided Solution - No Power or No Boot Troubleshooting.
If the newly attached display shows the first problemi BPH screen s but then goes blank or black, there is a problem with Windows starting. If the new display worksthe original display or its cables might be faulty. Complete the following instructions with the original, faulty display. If it is white or bluethe display is problemi BPH and problemi BPH a display signal, but might indicate another problem with the display panel. If problemi BPH is not amber, white, or bluecontinue to the next problemi BPH.
Turn on the display. If the display shows an image, you are done. If the display remains blank, continue using these steps. If the display does not work after problemi BPH the cables, replace or service the display. Reset and update the BIOS You can use these steps problemi BPH though you cannot see anything problemi BPH the display. In case an item was changed in the BIOS, such as the primary display device setting, use one of the following sections to reset the BIOS back to its default configuration:.
Turn on the computer and repeatedly press the F10 problemi BPH for eight seconds. If a BIOS update was not available or problemi BPH display is still blank, continue to the next section. Reseat loose internal components Typically beep code is associated with the computer not recognizing a card, memory, or CPU. Use caution when handling. To reduce the chance of ESD damage, work over a non-carpeted floor, use a static dissipative work surface such as a conductive foam padand wear an ESD wrist strap connected problemi BPH a grounded surface.
Disconnect all cables. Write down each cable location so you problemi BPH reconnect them in the future. With the power cable removed, press the Power button on the front of the computer for 5 seconds.
It might have tabs or thumbscrews, or some other method of securing the panel or cover to the computer. See your user problemi BPH for specific instructions for your computer.
Gently press down on the problemi BPH edges of cards and memory modules that are inserted into the motherboard to better seat them. Do not press too hard. If the display still shows a black screen, the video hardware might need to be replaced or serviced. If the display shows the first startup screen but does not display Windows, continue to the next section. Problemi BPH the display resolution You cannot do this if you cannot view the first startup screen.