This is not an uncommon problem with these ultrabooks. There are three potential culprits. the only way to determine which is the problem is to test each component. Its either the LCD cable to the screen, the LCD screen itself, or the video graphics on the motherboard, in which case the whole motherboard would need to be replaced. Be warned these laptops have an extremely intricate design and will be a nightmare to dissasemble and reassemble should you decide to do so.
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