White screen I've had my inspiron for only 2 years now and last month when I turned it on the screen was split and the dell start up log was on the bottom half and a gray screen on the top half. The next time I tried to turn it on the entire screen was white. I tried opening and closing the laptop and upon opening it again the screen was split with grey screens on both halves. If I left the laptop open the screen would slowly turn white from the edges in. Eventually I was able to log in but only after opening and closing the laptop several times, and even then I could till see that the screen was split because the top half was darker than the bottom. Can anyone help?

SOURCE: Dell Latitude D620 Gray Screen

I don't know about that particular laptop but it sounds like a loose connection between mainboard and screen plus a bad inverter (regulates and supplies voltage to the actual screen from the main power source). Laptops typically have the inverter hidden somewhere in the frame that surrounds the actual lcd screen. Sometimes this regulator is part of a small circuit board, sometimes it is not (I suppose it might be part of the actual lcd in some cases, but i've never seen that). I would investigate things further in that direction and just hope your lcd itself isnt bad.

SOURCE: Dell Inspiron 1501 screen half black

Had the same problem. Fixed it though. Here's how:
You'll notice that the screen comes back to life if you press down on the very top of the green line. This is because a controller circuit board behind the LCD screen (at the top) is pressure fit flat-surface-to-flat surface to the contacts on the back of the LCD. Eventually, the sticky substance that holds this circuit board in place wears thin, collects dust, etc.. and the connection between the circuit board and the lcd contact is lost. The line appears where this break in contact has occured. 
So, the solution is to increase the pressure at that point to reestablish the connection. I wasn't able to remove the circuit board to clean beneath it as it seemed too likely to cause damage. Nor would I have had the right adhesive to connect it back, so I simply removed the LCD and put a bunch of tape at that point so that it would "push" with a little more pressure when screwed back into place. Worked great.
To remove the LCD, pull off the 6 feet around the screen. Remove the screws behind them. Carefully pry off bezel with a small flathead screwdriver working your way around it. Once removed there are simply 4 screws on the left and 4 more on the right of the LCD to remove. Pull out screen carefully and start stacking bits of tape on the spot where pressure seems to work best. Put it back in and see if you've made any difference. I did this with the computer on so I could verify my results. Just be careful not to short out any naked contacts.
If this doesn't work for you, at least you'll know you just need to replace the LCD, not the video card. Easily found on ebay.

SOURCE: my screen has lost brightness

Sounds like your Back-light Bulb malfunctioning.

You may need to replace the Back-light, and possibly the Inverter as well.

Confirm that your Brightness setting is not set:
Look for your Function Key and and icon of a sun or a half/full circle. If this does not help then you have defective parts that need to be replaced.

SOURCE: Dell Inspiron 700m blank screen or won't boot

The problem you are facing sounds like either a video board problem, which I believe the 700 is hard solered onto the motherboard or an inverter board. The best way to test this is to hook up an external monitor to your laptop and see if the problem persists. If the problem does not appear on an external monitor, then the problem is most likely the inverter board in your laptop. If you are still having the problem with an external monitor, then your video card is at fault. The video card on this series I believe is hard soldered to the motherboard and cannot be replaced without changing out the motherboard. If the problem goes away with an external monitor then you just have to replace the inverter board on your laptop which you can pickup on eBay for around 30.00 + shipping.

SOURCE: Dell Inspiron 1300 - When I re-open the lid,Screen stays Black !

Your laptop either goes to hibernate or sleep mode when you close the lid. Then, when you open the lid up, the screen is still off because your pc already hanged/froze and could not wake up at all (usual problem in vista). Off course, hard shutdown would fix it. But actual fix is under power options on your control panel. Check your current scheme and edit it. There are options there that you can select to "do nothing when closing the lid"

Hope this helps