Diagnose Black Display / No Display Output in Your Computer

Edited by Liezel, Eng, Robbi, Nuance and 1 other

Liezel.gabiana no display monitor.jpg

Although you may be a USER, how are we supposed to use our computer effectively, if it isn't functioning properly, and there is no display output?.

Computers are no longer an option. In fact, they are pretty much a necessity for day-to-day life. They have become a fundamental tool for nearly everything we do, including what you are doing right now. You wouldn't have access to this article without some kind of device that allows you to go online. What used to be a privilege for a student to own a computer is now a necessity for every student in North America.

But now there's something wrong, and there is no display on your computer. This article will help you fix this issue on your computer, without having to call a technician. Before we proceed, please make sure you know how to protect yourself in case of a hazard - always safety first.

Diagnose Black Display on Your Computer

There are common issues that you may encounter when your personal computer is not properly shutdown or you experienced an unexpected power loss. Before checking the probable cause for the "No Display, issue you are facing, you need to prepare the following:

  • Anti-Static Band.
  • Screw Drivers.
  • Gloves.
  • Pen Eraser.
  • Wear closed shoes.

Now you're ready to start.

  1. 1
    Check your VGA cable to see if it's loose or not
    Make sure it is connected properly to your monitor and to your system unit (CPU). You can see the problem you're having with your computer by watching your computer keyboard light status.
    Liezel.gabiana numlockled.png
    1. When you switch ON the power to the computer, Num lock LED will turn ON.
    2. If it does not turn ON, try to push Num lock button ON/OFF.
    3. If it is not responding and the Num LED is not lit, often this means you have a computer memory failure.
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  2. 2
    Switch off your computer and unplug the power cord
    You can do this by holding the switch on button.
    1. Then open your system unit (CPU).
    2. Remove the memory card in the slot of the motherboard, slowly push up and push down the holder of the memory.
    3. Note: Don't touch the chips in any part of the motherboard and memory! You can only touch the edges or sides, otherwise you will damage of your computer.
    4. This is the sample of memory card. Proper handling of the computer's memory card:  
      1. Hold the memory card by the edges, as you can see from the photo below. Touching the flat side of the memory card where the electronic components are will damage it.
        ENG TUNE Liezel.gabiana proper handle of memory.jpg
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  3. 3
    Clean all the gold pins of the memory card, but still follow the instruction above
    1. Use pen eraser to clean the gold pins.
    2. After you clean the gold pins of the memory, choose only one memory to put back in the slot of motherboard. Do it perfectly.  
      1. All memory cards have a notch.
      2. Check your memory card thoroughly.
      3. The notch is a guide for you to perfectly insert the memory card into motherboard.
      4. You can use your both thumbs to insert and make sure it's in there tightly.
        Liezel.gabiana memorycardnotch.png
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  4. 4
    Switch your computer on again
    1. Plug in the power cord, and keyboard, monitor.
    2. After you switch on, and LED light of number lock is open and responding (success), there will be a display on the monitor.
    3. Oops! Don't be in too much of a hurry to insert another memory card.  
      1. Switch off first before insert another memory card.
      2. Make sure the power cord is unplugged before you put other memory card in the slot of motherboard.
        Liezel.gabiana motherboardnotch.png
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  5. 5
    If cleaning the memory wasn't enough
    If it is happen to you, and the above steps don't work, try:  
    1. Change your memory card. If after you change the memory card, and there's still no display...
    2. Check is your video card. Remember, only put one memory card in the motherboard when you are diagnosing and troubleshooting.  
      1. Always unplug the power cord when you touching the parts of computer.
      2. Carefully remove the video card in the motherboard.
      3. The video card has a random lock.
      4. Find where is it before you remove the video card.
      5. When removing, don't force to pull it. It should be easy to remove if you've removed the lock first.
      6. Clean all the pins of the video card (gold pins only).
      7. Replace the video card.
      8. Try to switch on again, plug the cord, keyboard and monitor.
      9. If you've been successful, there will be a display.
      10. If this doesn't work, replace your video card.
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  6. 6
    And now your problem has hopefully been solved.
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Tips, Tricks & Warnings

  • Before you do anything, remove the power cable of your Hard disk drive. This will make sure you don't damage any of your files, or cause harm to yourself.
  • If you've tried everything listed above, and there's still not output, and the display is still black, remove the CMOS battery found on the motherboard for 60 seconds, and then replace it.
  • Warning. Make sure before you doing this, you wear all personal protective equipment, to avoid electrostatic shock.

If you have problems with any of the steps in this article, please ask a question for more help, or post in the comments section below.


Article Info

Categories : Hardware

Recent edits by: Nuance, Robbi, Eng

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