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Grey to me tells me that the screens back light(s) are most likely functional but video graphics is not, i.e. doing what it's supposed to, i.e. paint/render images to the screen, could just be a loose connector. If you can, try connecting an external monitor if possible, reason to try and pinpoint if screen or cable to back of screen but under the lids front and back cover OR the video graphics driver. Hope that resolves it or at least put you on the right track.
This was very difficult to find, but I found it just for you! Please make sure you rate my answer 4 thumbs up! Thanks so much for understanding, it would be a huge help to me. I would be forever grateful if you could do this for me. To view the manual you will need adobe reader, which you can get for free from http://get.adobe.com/reader/ You probably already have it though, please try opening the file first and find out. Here is the manual / guide please give it a few minutes the file is quite large:
First could be you video drivers, go to the Dell website and ensure you have the latest version for you Laptop installed.
Once done, it could be either the graphics card/chip or screen.
1) Connect to a slave monitor using the VGA connector on the back and switching using the relevant Fn key.
If the slave monitor works, your graphics chip/card is good. You've got a screen problem
Could be 1 of 2 things faulty connection or faulty component.
The faulty connection you should be able to check.
Remove ALL power sources.
There's a plate which sits between the keyboard and screen. Check and remove any screws, they may be on the back of the screen hinge so have a good look.
The plate is clipped into position by tine plastic lugs, so, very carefully, prise the plate off.
Once off, check the multi pin connectors are home and good. If one was loose or poorly connected, you've probably repaired it. If there are no connectors in view, you may find them underneath the keaboard. Usually 2 or 3 screws at the top and lugs to position at the bottom.
If you have no joy after this, I'd suggest you need someone with expertise.
Usually that is caused by having bent one of the pins inside the laptop. Take the battery out, and look at the connectors with a nice strong light. See if one of them has been bent, or has jammed under the plastic connector dividers. If the connector is normal, then check the same connector on the battery. Also look for any severe blackening of the points of the connector. If they need to be cleaned, then use a pencil eraser, and very carefully drag it across the pins.
Most likely you have a loose video connection. Reseat the ribbon cable that connects the LCD screen to the motherboard.
This connector is located under the plastic panel that holds the power and various switches near the bottom edge of the LCD screen.
Perhaps your monitor is faulty. You should check it out at a repair store. Also, if you have a VGA connector for an external monitor, try with that. If the lines are gone, that means your monitor is faulty.