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HP and Compaq Desktop PCs - Monitor or TV is Blank after Starting the Computer

This document pertains to HP and Compaq desktop computers.
This document is about troubleshooting a video connection from a monitor (or a TV being used an a monitor) to a personal computer. If you have a computer that has the monitor built-in, such as a HP or Compaq All-in-One PC or HP TouchSmart PC, see Screen is Blank after Starting the Computer.
This document will help you determine if the blank screen is being caused by the computer hardware, the video signal to the monitor, or the monitor itself.
Before you begin
Check the following items before using the steps in this document:
  • Make sure the monitor has power and the power light comes on when the power button is pressed. If the light on the monitor remains off, the monitor is not receiving power from either the wall outlet or the power adapter.
  • If you have a flat panel LCD monitor, unplug the monitor power cable, wait about 30 seconds, reconnect the cable and then turn on the monitor. This resets the electronics on the monitor.
  • If the monitor has a detachable video cable, obtain a second monitor cable for testing purposes in case the cable is bad.
  • Disconnect all connected devices except the mouse, keyboard, and monitor. This includes removing thumb drives and camera-type memory cards from card reader slots.
Step 1: Listen to the computer and look at the lights
To help determine if the problem is being 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 may have came loose. Go to Reseat loose internal components to check for loose components.
  • Do you hear the computer's fans spinning? If you do not hear noise from the fans and the power lights on the computer are not on, the problem is related to the computer, not the monitor. To continue troubleshooting a computer that does not start, select your operating system below:
  • If you 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 monitor. Continue to the next step.
Step 2: Connect the computer to another monitor
Connect another monitor to the computer to determine which device has the problem (the monitor or the computer). If you do not have an extra monitor, temporarily connect the computer to a friend's monitor for troubleshooting purposes.
After the monitor is connected, turn on the computer and the monitor. What happens?
  • If the newly attached monitor does not display anything, disconnect the cable and continue at Step 3: Inspect the video cable and video connectors for damage
  • If the newly attached monitor displays the first startup screen(s) but then goes black, there is a problem with Windows starting. Skip to Step 5: Change the display resolution.
  • If the new monitor works, the original monitor or its cables are faulty. Do the following:
    1. Replace the monitor power cable.
    2. Turn on the monitor. If the monitor displays an image, you are done. If the monitor remains blank, continue using these steps.
    3. Replace the video cable.
      Turn on the monitor. If the monitor displays an image, you are done. If the monitor remains blank, continue using these steps.
    4. If the monitor does not work after replacing the cables, replace or service the monitor.
Step 3: 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. With the monitor and computer off, try to straighten bent pins with a small metal tube, like the tip of an empty mechanical pencil or the tip of a retracted pen.
Figure : Video connector
If you had to straighten any pins, reconnect the monitor making sure that the video cable is firmly connected and then turn on the computer and monitor. If the display is still blank, continue to the next step.
Step 4: Reset and update the BIOS
You can use these steps even though you will not be able to see anything on the monitor.
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:
Step 5: Reseat loose internal components
If the computer case was recently serviced or moved, a card, cable, memory module, or processor may have become loose. When this happens, the computer might make a beeping sound when turned on. Use the following steps to check for loose components:
Step 6: Change the display resolution
This step will not work if you cannot view the first startup screens as noted in the previous section.
Use the following steps to change to a compatible display resolution and color depth setting from a standard graphics mode. For flat panel LCD monitors, set the display resolution to the monitor's native display resolution.
 note:
Connect the computer to a working monitor to perform these steps.
 note:
If you cannot select your monitor's native display resolution, then update the computer's video drivers and repeat this step.
  1. Turn on the computer and press the F8 key repeatedly when the first startup screen appears.
  2. Increase the display resolution as follows.
Step 7: Disable power settings in BIOS
If Windows was recently upgraded, Windows might be starting up into a Power Saving state and producing the blank screen before it loads. After Windows loads (about 2 minutes after turning on the computer), press the power button briefly or press the Suspend key on the keyboard to see if the computer comes out of a suspended state. If the computer opens into a suspended state every time the computer is started, use the following steps to disable Power Savings in the BIOS.
 note:
Connect the computer to a working monitor to perform these steps.
 note:
If you are still experiencing problems with an LCD flat panel display, there are more steps you can use to resolve your problem. Please refer to the HP support document Screen Is Blank after Starting the PC, or Power Adapter Connector Appears to be Missing (in English).
Step 8: Replace the video card or have the hardware serviced
If you have tried all of the steps in this document and are still having the issue, the hardware is probably faulty.
If the monitor does not work on another computer, the monitor may be defective. The monitor should be replaced or serviced. You can Contact HP (in English) to find support if your monitor is in warranty or an authorized service center to assist you if your monitor is out of warranty.
If the monitor works on another computer and the computer has a video card, try replacing the video card on the computer.

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