bad lcd on my hp pavilion dv4

hi experts,

 looks like my screen went out on my laptop. I hooked it up to an extenal monitor and I have video. The strange thing is that when I turn off my laptop and disconnect it from the external monitor the lcd on my laptop all of a sudden works and I see the message system turnnig off..... but then when it completely turns off and I boot it again , I have to connect to an external monitor to get video.
frankbustosSystems AdministratorAsked:
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PerarduaadastraCommented:
It sounds like the backlight is the problem, rather than the screen itself. I'm not familiar with the precise details of the screen in your laptop, but it may be that it's just the inverter powering the backlight that needs to be replaced. If the backlight itself is integral with your screen I would try the inverter first anyway, as it's a lot cheaper than a new screen.
Rob MinersCommented:
If an image displays on the external monitor but not on the notebook display, download and install the latest graphics driver, and the latest CPU chipset drivers.
As a last resort download and install the latest BIOS.

Using HP Support Assistant to find updates automatically (Windows)

http://h10025.www1.hp.com/ewfrf/wc/document?docname=bph07165&lc=en&cc=us&dlc=en&product=4186284
nobusCommented:
here they say this is a known problem with the cable, and suggest replacing it :
http://h30434.www3.hp.com/t5/Notebook-Display-and-Video/Hp-Pavilion-dv4-1412tx-Flicking-Backlight-Problem/td-p/896711

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frankbustosSystems AdministratorAuthor Commented:
thanks
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