To determine if the video card or the LCD screen is faulty, connect an external monitor to the video port on the laptop. Power up the monitor first and the boot up the laptop, the video data will automatically divert to the external monitor. If you get a normal image on the monitor then the video card is OK and the fault is LCD screen or the video cable. If you don't get an image on the monitor then it is a video card problem, and it is a motherboard problem.
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