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Hook up to an external monitor and see if the display is OK. This will sort out the video is OK or not. Do that and post back. 
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Hello,<br />
<br />
&nbsp; &nbsp; &nbsp; In agreement with Punky you would want to connect the display to an external monitor. &nbsp;This is to very that the graphics card works correctly. &nbsp;After doing this you would want to most likely replace the display. &nbsp;As a certified Dell technician I have seen this problem multiple times. &nbsp;You cannot simply replace the cable because the LCD is one unit. &nbsp;I would strongly suggest to contact HP support at 1-800-474-6836. I hope this helps :)<br />
<br />
Matt Dwyer
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The external monitor shows the same image so my conclusion is that the graphics card is broken, right? Is motherboard replacement the only solution?
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The display seems to be broken on my laptop as you can see in the attached screenshot. Which component should be changed to make the screen ok again? Can it be a loose cable or should the entire display be switched?<br />
<a href="https://filedb.experts-exchange.com/incoming/2008/08_w32/48458/S4300036.JPG" target="_blank" class="file-inline" title="Broken display (367 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>S4300036.JPG</a>
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S4300036.JPG

The display seems to be broken on my laptop as you can see in the attached screenshot. Which component should be changed to make the screen ok again? Can it be a loose cable or should the entire display be switched?

Hook up to an external monitor and see if the display is OK. This will sort out the video is OK or not. Do that and post back. 

Hello,

      In agreement with Punky you would want to connect the display to an external monitor.  This is to very that the graphics card works correctly.  After doing this you would want to most likely replace the display.  As a certified Dell technician I have seen this problem multiple times.  You cannot simply replace the cable because the LCD is one unit.  I would strongly suggest to contact HP support at 1-800-474-6836. I hope this helps :)

Matt Dwyer

The external monitor shows the same image so my conclusion is that the graphics card is broken, right? Is motherboard replacement the only solution?

HP NC6000 display broken

A laptop or notebook is a portable personal computer with a clamshell form factor, suitable for mobile use. Although originally there was a distinction between laptops and notebooks, the former being bigger and heavier than the latter, there is often no longer any difference. Laptops are commonly used in a variety of settings, such as at work, in education, and for personal multimedia. A laptop combines the components, inputs, outputs and capabilities of a desktop computer, including the display screen, speakers, a keyboard, and pointing devices (such as a touchpad or trackpad) into a single unit. The device can be powered either from a rechargeable battery or by mains electricity from an AC adapter.

Laptops Notebooks

A monitor or a display is an electronic visual display for computers, usually comprised of the display device, circuitry, casing, and power supply. The display device in modern monitors is typically a thin film transistor liquid crystal display (TFT-LCD) thin panel, while older monitors used a cathode ray tube (CRT) about as deep as the screen size. They are connected to the computer via VGA, DVI, DisplayPort, Thunderbolt, LVDS or other proprietary connectors and signals.