C800 display problem!HELP

I tried.Wit the external monitor is ok.So I must now change the LCD?Can't repair?

Try an external monitor. If the line disappears, the LCD panel is faulty - the only sure way to fix the issue is to replace the screen.

Many LCD problems can be repaired, but defective lines in the display usually cannot.

Your best bet is to contact and LCD repair specialist for a definitive statement, but expect that you're going to hear that replacing the panel is the only option. The symptoms point to a failure in the panel itself, not the electronics - the latter can usually be economically repaired; the former cannot.

I was talking with a computer engineer about my problem.After he saw the screan, because that line is blue he told me that the problem is with that thing in the LCD wich distributes the three main colors (red, green, blue) and the reason why the line is there is that this thing sends too much blue in that place.Actually tha line is wery tin but however, he told me that the LCD is ok only that controller or what is defective.
What is your oppinion?Is that right?Can this be repaird?

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@vedtom wrote:
......that thing in the LCD wich distributes the three main colors (red, green, blue) and the reason why the line is there is that this thing sends too much blue in that place..."

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That thing sounds like your video card, have you tried reinstalling its Drivers.

Dell Diagnostics (get from Product Support; Downloads for your system, if you do
not have them on your HD or on diskettes) will also test your Video System
Hardware.