My notebook screen 3000 n100 goes dark after few second

This could be a faulty CCFL lamp.
To determine if you have a LCD screen, inverter or video card problem, read this and follow these instructions.
Defective CCFL backlight, it may have the following symptom: Screen flashs on red/pink and off. Picture stays on in red and slowly be come normal. Picture flickering with dim display or appear black. Picture flickering on and off. All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp.
Connect an external monitor to your laptop and power the monitor up first then the laptop, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight. Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out
www.lcdparts.net
for parts, repair service and DIY info.

Hi..

Most laptop PCs include external video outputs, primarily VGA (Video Graphics Array), with an increasing number of devices offering DVI (Digital Visual Interface), or HDMI (High Definition Multimedia Interface) support.

When your laptop PC's built-in display isn't working properly, you can quickly and easily determine if the problem relates to the built-in graphics circuitry or to the display itself by plugging in an external monitor. If the external monitor lights up and things work as they should, the built-in display is at fault. If the external monitor also fails to work, it's likely that your laptop PC graphics circuitry has failed. Because this can involve replacing a standalone graphics module or the system board inside the laptop, depending on the make and model of your computer, you need to perform a cost-benefit analysis on making repairs or replacing your laptop PC.


Good luck !!!

Regards
PCmania