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Laptop display only sometimes displays

I have a Dell XPS laptop that usually doesn't display anything on the monitor, even during POST, before it gets to Windows. I can see the LCD backlight is on, but nothing is displayed. When it does work, sometimes it stays on, sometimes it goes black before it gets to the Desktop. Is the problem the monitor, video card, or something else? Thanks!
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amit_10

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Brilliant! I can't believe I didn't think of that. I'll try and report back.
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I just connected a monitor via the VGA port and it displayed perfectly. I also tried moving the laptop monitor around to see if that would wiggle something in to place and no luck with that. So, all this being said, does this sound like a faulty laptop monitor? Remember, it randomly/rarely works. Thanks!
...and when it does work it seems to be only when the monitor is only barely opened, not up all the way in a normal viewing angle.
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you can start by reseating the video connector( comes loose sometimes)
you'll need to open the laptop for it
in this case if u got luck  your display may work with some sort of arrangements like   g8kvb  said open it gently and watch at which angle ur display work ( it maay work )

the better way will be to go to customer support
either your display panel is faulty or it may have some loose connections(inside the panel)

You can get the service manual of your model from the dell site and it will give you steps how to get to the video connector.
You should try to reset as suggested by Nobus.

http://support.dell.com/support/edocs/systems/

Select the correct model from the above link.
The problem is a damaged display cable. Seems the repeated open/close of the display wore away at the cable as the hinge rubs against it. Thanks!