Laptop Screen Problem, Please help?

I've been having problems with my Sony VAIO laptop screen. On exactly half of my screen, white vertical lines appear. At first they are not very noticeable, but they have gotten progressively brighter and they get in the way. You can still see behind them but they distort the image. Then it went from these white lines to really dark black lines that cover half the screen. You cant really see anything on that half, but if you pull a window to that side, you can see some of the color behind the black lines, so its not completely blank.

I had this problem half a year ago, when the computer was still under warranty and they replaced the screen. It is now obvious that the problem isn't with the screen but with the connection between the computer and screen.

Can anyone give me suggestions as to what to do, where exactly the problem may be, or how I would go about fixing it. Any help is much appreciated, thank you.