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If the external monitor works fine then most likely there is nothing wrong with the motherboard or video card and the problem is somewhere inside the laptop display panel.

Here's what I usually do in order to narrow down problems like this:

1. I reseat the video cable connectors on both ends, on the motherboard/video card and on the back of the LCD screen. If the video cable gets loose, it might cause a problem like on your laptop.

2. Replace the video cable

3. Replace the LCD screen

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Q: Laptop monitor samsung R40 flickering and showing nothing but blue white colors. I connected the laptop to an external monitor and the laptop works. is it the source of the monitor the problem?
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