Vertical Line on Monitor

I have a Dell 9300 notebook. I've noticed that there is a visible vertical line on the right hand side of the display. The line appears to be blue in color. The top half of the line is visible at all times whereas the bottom half of the line is only visible with certain display backgrounds. It appears as if I lost a whole row of pixels. I experimented by changing the monitor resolution but the line did no go away. I also plugged in an external 17" CRT monitor into the laptop video output, and the line was not reproduced on the CRT monitor. I assume that this indicates that it is not a video card problem. I’ve ran the PSA diagnostics but came up with nothing. Have I really lost a row of pixels or can the problems be something else? The notebook is about 18 months old so the warranty has expired. Thanks ahead of time for help anyone can give me on this issue.