Vertical lines screen

SOURCE: Dell 9300 screen

http://direct2dell.com/one2one/archive/2007/04/09/10675.aspx

This is a known factory defect. Dell has a recall on it for Inspiron 9300 shipped between Nov 2004 and Nov 2006.

I just called Dell Tech Support (1-800-624-9896) to get this replaced and they are fixing it free of charge because I bought mine in December 2005. They are sending me a postage-paid box to ship back the laptop (remove the battery before sending it back to them, per instruction).

NOTE: Not all Tech Support people are well trained. The first time I called earlier today (Nov 21, 2007), the tech said (incorrectly) that only units shipped between Feb and March 06 are covered and denied that Dell would cover it for me. I was fuming mad.

Then I surfed around and found the link above which is Dell's official response. I called Tech Support back and got a better tech person. Moral of the story >> if you're certain your computer is covered per Dell's official statement, don't let the tech guys push you around. Email them the link from their own site if you have to. Better yet, just hang up and call back and hopefully you'll get someone who knows what he's talking about.

When you call Tech Support, have your Express Service code ready. They use this number to loop up whether or not your laptop is in the recall group. This number is at the bottom of your laptop on a long skinny oblong white tag.

SOURCE: Dell Inspiron 700m screen acting up

try to uninstall and install the the display drivers / graphics card drivers.. it should help you.

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: XPS 1330 screen turns black

Instead of removing the battery you can hold the power button down for about 5 to 8 seconds. Unfortunately your problem is with the graphics card. Luckily for you the xps laptops have upgradeable graphics cards and it can be replaced. You will want to make sure it is the graphics card first most likely. do you have any other dell xps laptops around? It may also just be that the card is overheating. removing the card and cleaning the cooling fins might fix your problem. Does it seem to do it only after the laptop has been on for a while? What exactly do you mean by it blocks?

SOURCE: Dell XPS 1330 - screen goes funky with lines memory parity error

The same exact thing happened with mine less than 6 months after I got it, and the tech came out and replaced the motherboard. Before I called for support I was able to boot it up in safe mode after several attempts, but it finally crapped out. Sounds like you need a new one again. If it's not under warranty, you can just replace the part yourself with the right tools. I told the tech who came out to my house that I had purchased the 3 year warranty and he told me I did the right thing. Let me know if you need assistance.