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Monitor does not light up when laptop is turned on. sound works and computer starts up but screen is dark and can barely make out any display. tried adjusting brightness key with no result.

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It may be due to the inverter unit inside the lcd panel defective . replace the defective unit.

Posted on Apr 04, 2008

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Posted on Jan 02, 2017

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Computer tutorial


What ??? is this a desktop or laptop ?
Do you mean you cant see yout laptop screen ?
The display on your laptop is the interface through which you interact with and control your computer.
If it is not working, your laptop will become virtually impossible to use.
A laptop is a computer, and like all computers is subject to both hardware and software problems that may affect the display.
Before taking your laptop in for repair or getting rid of it, you should first check the display yourself to see if it needs to be replaced.
Check the laptop's battery and power cord.
If the laptop is out of power, the display will not work.
This usually happens if the power cord is unplugged and you were unknowingly running your laptop on battery power.
Check to make sure the power cord is plugged in and that the laptop has power.
Many laptops also turn off the display if it is being powered by its battery after a period of nonuse. Touching any key will usually turn the display back on if the battery is not drained.
Restart your computer. If a software program is stuck or malfunctioning, it may cause your display to stop functioning.
Press and hold the "Power" button on your laptop to reboot your computer.
If the problem was a malfunctioning program, the display will turn on after the computer restarts.
Check the brightness level of the display.
If the level is too low, the screen will appear dark.
The brightness controls are usually located on two function keys, such as "F9" and "F10." Look for sun or light icons on the keys.
Press the key with the larger icon to increase the brightness level.
Alternatively, on some laptops hold the "Fn" key while simultaneously pressing the "Up Arrow" key to increase the screen brightness.
Check the display closed switch.
Many laptops have a small button that senses when the LCD screen is closed and puts the laptop in sleep or hibernation mode.
WARNING: Before you start troubleshooting remember that you are dealing with electricity that can KILL.
http://www.kitchentablecomputers.com/static.php - rules
Only work inside the computer case when the power has been switched off and disconnected. Never open the power source.
Some of the below steps recommend removing physical parts within the computer.
While in the computer it is highly recommend that you be aware of ESD and its potential hazards.
Check your RAM.
The RAM is located in the middle of the motherboard.
There are tabs that you can push to release the RAM.
Remove it and put it back in place until the tabs pop out.
Loose RAM can cause your computer not to start properly where you want to see a video signal.
Remove the memory modules from their slots.
Take the opportunity to clean the slots on the motherboards and the memory module connectors.
Use compressed air to blow dust away and clean contacts with a soft cloth.
Do not use a metallic vacuum cleaner if it touches any component it may create a short and cause damage to the motherboard or other components.


Do not use solvent that may attract dust and never poke things like cotton buds in to slots. lightly rub an alcohol (Methylated Spirits) on a cloth not to hard let the alcohol do the work on the copper gold or silver tabs and r
Allow the pins to dry.
They will air dry in a matter of minutes.
If reseating the memory did not resolve the issue try swapping the location of the memory.
Make sure your graphics card is securely seated with no dust built up or in the socket
if you remove your graphics check the socket to make sure its dust free
If the switch gets clogged with dirt, it may get stuck in the closed position.
This will result in dark display even when the lid is open.
The switch is usually located near the hinges of the lid. Spray the switch with a can of compressed air to loosen the dirt so that it will resume its normal operation.
Plug an external monitor into your laptop.
If the problem is not software related, the external monitor will display the laptop's screen.
Connect the monitor by plugging the cable into the VGA, HDMI or DVI port on the laptop.
Press and hold the "Fn" key while simultaneously pressing the "F8" key.
The video output will be directed to the external monitor if there is a hardware problem.


Nov 18, 2013 | Computers & Internet

1 Answer

Hp pavilion dv7-4165dx black screen


A blacked-out screen doesn't necessarily indicate a broken monitor.
If the computer has run out of charge or is in hibernation or sleep mode,


if the screen is too dark, or if the display cable has come disconnected from the motherboard, the screen may appear black or fail to turn on.


To fix a blacked-out laptop screen, troubleshoot the screen settings, check the LCD connector and see if the computer is awake and receiving power.


Touch the touchpad or move the external mouse to see if the computer is asleep or hibernating. If the computer fails to respond, press "Enter" on the keyboard.


Press the power button if the screen remains black.

Confirm that the power indicator light, found at the front of the computer or above the keyboard, is glowing solid green or blue.


Confirm that the power adapter is plugged into the computer and into a wall outlet. Confirm that battery indicator light is glowing solid green or blue.


Hold down the "Fn" key. Press the up-arrow to see if the screen brightness increases.
Some computers also use the "F6" or "F7" keys to increase screen brightness.


Hold down the power button for 10 seconds to turn off the laptop.
Remove the AC adapter from the computer, close the screen, and then turn the PC over.


Slide the battery latch to eject the battery. Pull the battery out of its compartment.


Turn the computer back over, open the lid, and insert the edge of a flathead screwdriver or other flat, solid object beneath the bezel above the keyboard.


Wedge the edge of the keyboard bezel off of the top cover.
Work your way along the edge of the keyboard bezel to loosen it.
Pull the bezel off the laptop.


Trace the cable coming from the laptop screen to the connector found beneath the bezel. Reconnect the display cable to the motherboard if the cable has come loose from the connector.

Line up the tabs on the bezel with the slots along the top of the keyboard. Insert the right edge of the bezel into the gap above the keyboard, and then push the bezel back in place.


Turn the computer back on. If the laptop screen is still blacked out, connect an external monitor to the video port on the side of the PC to confirm that the video card isn't defective.

If the external monitor works, the LCD screen could be broken.

If the monitor doesn't work, the motherboard or video card might need to be replaced.


Hope this helps




Nov 26, 2012 | Computers & Internet

1 Answer

No Graphics


Shine a flashlight on the dark screen to see if you barelysee the icons on the desktop. If so, then the LCD Inverter is bad.

Plug in an external monitor and see if the display shows up on it. It can beany kind of monitor even the old big fat crt monitors as long as it has a vgacable to connect to your computer's vga port. If so that proves yourvideo card is ok. The video will show on most systems when you rebootwithout you having to do anything. Some systems will require you to hit the FN(Function key) + F1 thru F12. Hold down the FN key then hit the correctkey for displaying on the monitor (F1 thru F12). The correct key willnormally have CRT/LCD on it or it will have the icon of a display.

If you see no icons by shinning a flash light and the external monitor works,then your screen is bad. If you see no icons by shinning the flash lightand nothing shows on the external monitor, then most likely your video card isbad.

May 06, 2012 | Sony VAIO Digital Studio PCV-RS220 PC...

1 Answer

Acer aspire m1640 repair


So the fan is running, what about the hard drive? Do you hear the hard drive spinning?
If it looks like it booted all the way except the display is blank try the steps below.

Shine a flashlight on the dark screen to see if you barely see the icons on the desktop. If so, then the LCD Inverter is bad.

Plug in an external monitor and see if the display shows up on it. It can be any kind of monitor even the old big fat crt monitors as long as it has a vga cable to connect to your computer's vga port. If so that proves your video card is ok. The video will show on most systems when you reboot without you having to do anything. Some systems will require you to hit the FN (Function key) + F1 thru F12. Hold down the FN key then hit the correct key for displaying on the monitor (F1 thru F12). The correct key will normally have CRT/LCD on it or it will have the icon of a display.

If you see no icons by shinning a flash light and the external monitor works, then your screen is bad. If you see no icons by shinning the flash light and nothing shows on the external monitor, then most likely your video card is bad.
If you don't think the system booted all the way then try the steps below.
Beep tones and blinking lights tells the technicians what is going on with the laptop and why it is not booting. Most times it's a motherboard issue when you hear beeps or blinking lights continuous. Most times the problem is with the memory or Video Card. Count the Blinking Lights or Beeps and take note of their pattern (1 Long or 1 Long followed by 2 Short).

Maybe your memory is bad or the memory slot is bad.

Remove the Power Cord, Open the Case and remove one of the memory chips. Set the chip aside then try rebooting the computer. If it boots, then you know the memory chip you set aside is bad so mark an x on it with an ink pen. If it fails to boot then move the chip to the next memory slot and try rebooting. If it fails take the chip out and set it aside, then put the other chip in and try booting it in both slots. If it boots, just to verify that the chip set aside is bad, mark an x on it and put it into the open memory chip slot and try booting.

May 06, 2012 | Computers & Internet

1 Answer

My sony viao vgc-va10g has power but screen wnt turn on .


Shine a flashlight on the dark screen to see if you barely see the icons on the desktop. If so, then the LCD Inverter is bad.

Plug in an external monitor and see if the display shows up on it. It can be any kind of monitor even the old big fat crt monitors as long as it has a vga cable to connect to your computer's vga port. If so that proves your video card is ok. The video will show on most systems when you reboot without you having to do anything. Some systems will require you to hit the FN (Function key) + F1 thru F12. Hold down the FN key then hit the correct key for displaying on the monitor (F1 thru F12). The correct key will normally have CRT/LCD on it or it will have the icon of a display.

If you see no icons by shinning a flash light and the external monitor works, then your screen is bad. If you see no icons by shinning the flash light and nothing shows on the external monitor, then most likely your video card is bad.

Apr 24, 2012 | Sony Computers & Internet

1 Answer

My viewsonic flat monitor screen is not working properly! I plugged everything in and I've checked it so many times.I turn on the computer than When I turn on the monitor I can still kind of see the...


the viewsonic lcd has lost the backlight. realistic at the price of a new monitor the labor and parts to replace the backlight make repair not practical. there are parts and instructions available online and I have replaced them. not fun

Apr 18, 2011 | Computers & Internet

3 Answers

Computer shuts down


Please visit the below link to solve your problem.Due to some problems I was unable to send you the whole solution so please visit the site.

http://www.ehow.com/how_113600_troubleshoot-computer-wont.html

Thanks And sorry for the inconvenience.
Please rate me for this solution if it works for you.
  • Step 2 If you're starting from a button on the keyboard, make sure the keyboard is connected to the computer.

  • Read more: How to Troubleshoot a Computer That Won't Start | eHow.com http://www.ehow.com/how_113600_troubleshoot-computer-wont.html#ixzz0szt64gb5
  • Step 4 If you can hear the computer's fan or hard-disk drive, or if you can see indicator lights on the main unit but the monitor stays dark, make sure that the monitor is connected to a working power source, that it's turned on and that it's securely connected to the computer via the video cable.
  • Step 5 If the monitor and computer have power but the computer displays a "Non-system disk or disk error" message, check to make sure you didn't leave a disk in the A: drive. If you did, eject it and restart the computer.

  • Read more: How to Troubleshoot a Computer That Won't Start | eHow.com http://www.ehow.com/how_113600_troubleshoot-computer-wont.html#ixzz0szsjH6o9
  • Step 4 If you can hear the computer's fan or hard-disk drive, or if you can see indicator lights on the main unit but the monitor stays dark, make sure that the monitor is connected to a working power source, that it's turned on and that it's securely connected to the computer via the video cable.
  • Step 5 If the monitor and computer have power but the computer displays a "Non-system disk or disk error" message, check to make sure you didn't leave a disk in the A: drive. If you did, eject it and restart the computer.

  • Read more: How to Troubleshoot a Computer That Won't Start | eHow.com http://www.ehow.com/how_113600_troubleshoot-computer-wont.html#ixzz0szsjH6o9
  • Step 4 If you can hear the computer's fan or hard-disk drive, or if you can see indicator lights on the main unit but the monitor stays dark, make sure that the monitor is connected to a working power source, that it's turned on and that it's securely connected to the computer via the video cable.
  • Step 5 If the monitor and computer have power but the computer displays a "Non-system disk or disk error" message, check to make sure you didn't leave a disk in the A: drive. If you did, eject it and restart the computer.

  • Read more: How to Troubleshoot a Computer That Won't Start | eHow.com http://www.ehow.com/how_113600_troubleshoot-computer-wont.html#ixzz0szsjH6o9
  • Step 4 If you can hear the computer's fan or hard-disk drive, or if you can see indicator lights on the main unit but the monitor stays dark, make sure that the monitor is connected to a working power source, that it's turned on and that it's securely connected to the computer via the video cable.
  • Step 5 If the monitor and computer have power but the computer displays a "Non-system disk or disk error" message, check to make sure you didn't leave a disk in the A: drive. If you did, eject it and restart the computer.

  • Read more: How to Troubleshoot a Computer That Won't Start | eHow.com http://www.ehow.com/how_113600_troubleshoot-computer-wont.html#ixzz0szsjH6o9

    Jul 06, 2010 | Dell Inspiron 530 Desktop Computer

    1 Answer

    When you press on the power button, it sounds like the laptop starts because the hard drive makes noise, LED on the DVD drive lights up, but there is no picture on the screen. if you continue turning the...


    You may look into buying a new video card because what you just described to me it sounds like you need a new video card installed asap. Let me know if this helps.

    Apr 02, 2009 | Computers & Internet

    1 Answer

    I have an Evesham Explorer A5500 notebook Laptop and earlier when i was usuing it the screen became covered in white lines i rebooted to try and fix the problem but now when i turn on my laptop the screen...


    Take a bright light and shine it on the screen when it is on. Can you barely see any display, but really dark? If so, the lamp or the lamp inverter has failed (some laptops use LEDs instead of CCFL lamps and has no inverter either).

    Just hooking up to another display doesn't necessary tell you anything if it doesn't show anything. As sometimes you have to change a settings in the BIOS, use the Fn key plus another key that looks like a monitor, or change it through a display menu on the screen.

    Jan 30, 2009 | Computers & Internet

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