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When laptop is powered up, nothing shows on screen. I can here the audio intro but no display. Model is: MT3421

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Try connecting an external monitor and see if it displays, if it displays OK you might have a problem with your inverter circuit or the back light of you laptop's LCD. If so you have to bring it to the repair shop. cheers.

Posted on Nov 10, 2008

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I have a hp laptop. was on line and screen went black. and will not show again. it strats up sounds but black screen.what do i do


1) Do you have a VGA monitor that you can use for an external monitor?
{VGA monitor is also referred to as a CRT monitor. Looks like a small TV}

The back of the laptop, or side, has a VGA port. The VGA monitor is plugged into it.
{Laptop off}
Then the VGA monitor is turned on, and allowed to 'come to life'.

Now turn on the laptop. Press the Fn key down on the keyboard, and hold it down.
Now press the Monitor toggle over key.
Since you did not state the HP laptop Model Name, and Model Number, I can only give you generic guidance on this.

The monitor toggle over key has a monitor screen symbol on it. It will be one of the F keys.

(It's an External Monitor toggle key.
Press it one time and the display toggles over to an external monitor.
Press it again, and both the laptop LCD screen, and the external monitor have a display on them.
Press it once more, and the display goes back to the laptop's LCD screen )

If display shows up on the external monitor, you have a problem with the display of the laptop.

Primer:
An LCD screen cannot produce enough light by itself. It needs an additional light source.
A Backlight is used as an additional light source.

A Backlight is a CCFL.
Cold Cathode Fluorescent Lamp {Bulb}
Similar to the fluorescent lighting used in homes and businesses, but on a MUCH smaller scale.

{Average Backlight is 3 to 5 inches long, and half the diameter of a No.2 pencil.
The Backlight is located on one edge of the LCD screen}

An Inverter is used to provide power for the LCD screen, and the Backlight.

90 percent of the time the problem is the Inverter.

Inverters are relatively cheap, and if I knew the Model Name, and Model Number of your HP laptop, I could give you a link to HP Support where you could download the Service Manual for free.

This way you would have a manual to show, and detail how to replace the Inverter, and I could guide you.

I could also give links for your perusal for Inverters.

There is one more thing however.

HP Pavilion DV2000, DV6000, and DV9000 series laptops, have a graphics chip overheating problem.
The laptop comes on, the blue indicator LED lights light up, but the LCD screen is black.

This video explains why, shows a solution to fixing the problem, and details out a lot more than I am privileged to state here,

http://www.youtube.com/watch?v=bnkQNmKauEc

Have further questions regarding any of the above, please state in a Comment.
(Believe upper right of your page)

Regards,
joecoolvette

Dec 02, 2010 | PC Desktops

1 Answer

My compaq laptop powers up but the monitor stays black i tried to plug it in a monitor and nothing.


Unfortunately..your display may be shot...Is it a Compaq Presario? These laptops have a history of display problems...I have a Compaq Presario R3000 and the display is showing a reddish color in the left bottom corner of the screen and my brother had a similar problem with a Compaq laptop where the monitor stopped working....Unfortunately it would cost more to replace the monitor than to buy an Apple MacBook...
You can buy a cable and attach the laptop to a desktop monitor and it will work although you will lose the mobility of the laptop which is what makes a laptop so appealing.
If your laptop has a NVidia graphics card you can go to display in control panel and set it up to use Plug & Play Monitor but you may need to use safe mode or you wont be able to see anything because your screen doesn't work....You might get lucky and when you plug in the cable (just like you would to attach a PC tower to a monitor), it will work and you will be able to make the monitor the dominant screen.

Oct 29, 2010 | PC Desktops

1 Answer

My screen on my laptop just went all black with a very faint image. what is wrong there, how do i fix it, and what made this happen?


A) What is wrong?;
Your Backlight has gone bad, or the Inverter.

B) How do I fix it?
Replace the Backlight bulb, or the Inverter

C) Backlight bulb's, and Inverters, like everything have a 'lifespan'
This one is at the end of it's. (Stating the Backlight or the Inverter

From here all I can give you is Generic information, since I do not have the laptop manufacturer name, and Model Number. This is on the bottom of the laptop.

1) An LCD screen cannot produce enough light by itself. A Backlight bulb, (Or more than one), is used to emit enough light.

2) A laptop cannot produce enough power to power the LCD screen, and is also used for power to the Backlight.

I'll have to discuss the way the Display Assembly is put together, and name parts in order to explain the following of how to repair. Again, generic information.

1a) The plastic top of the laptop is the Top Cover. There are different names used by different manufacturers.

1b) Looking at the LCD screen with the laptop open, there is a plastic frame that goes around the edges of the LCD screen, and is in Front.
This is the Display Bezel

1c) The LCD screen is behind the Display Bezel. The LCD screen is a composite of layers. The outside layer that faces you is a protective screen.
Around these layers composing the LCD screen, is a metal frame.
One side, (Or both sides) of the metal frame is removed to access the Backlight bulb.

1d) The Backlight bulb is a CCFL.
Cold Cathode Fluorescent Lamp.
Very similar to the fluorescent lamps, (Bulbs) uses in residential, and commercial applications, but on a MUCH smaller scale.

Now to show you generic laptop info on replacing the Backlight bulb for them.

A) http://www.insidemylaptop.com/category/backlight/

B) http://www.laptoprepair101.com/laptop/2007/12/09/replace-laptop-backlight-ccfl-lamp/

If I had the laptop manufacturer name, and Model Number, I could try to give you a link to the Service Manual for the laptop. (Free. Usually from the laptop manufacturer)
This way you would have Exact info on how to disassemble your laptop's Display Assembly.
Post in a Comment.

Oct 13, 2010 | PC Desktops

1 Answer

I have an aspire 5535-6631,power is on but screen is blank.


need some clarification do you see acer name on the screen when u boot the laptop. if it not then u might having the issue with screen or the display card. u need to buy the screen or the motherboard. if you stay in india then i can tell u location where they can repair the issue.

May 13, 2010 | PC Desktops

1 Answer

Cant get 4600i started. powers up but will not get past intro screen. screen shows F1 to continue and when i press F1 it tells me to press it again to retry reboot, F2 for setup options.


you need to go to cmos or bios setup, set all the date and time and proper boot setting there save and exit, it is a cmos or bios failure that causes these problems try replacing the cmos battery if the message still continues

Nov 22, 2009 | Dell Dimension 4600 PC Desktop

1 Answer

HP Pavilion DV 9429 notebook - worked great at noon today - this evening powers up - all lights come on but nothing on display - powers on and off - tried turning power off - doing the Alt,Control,...


try this keep the Fn button pressed in and press a key with a square on it. mines is F5 but it differs on various PC/Laptops mate

it looks like a pc logo and a blank screen on it to switch between screen modes let me know how you get on...

Sep 25, 2008 | PC Desktops

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