Sounds like a specific issue with the LCD of the notebook. if the ac adapter is already connected to the system and same issue, try to adjust the brightness level of the LCD usually by pressing FN + up arrow key or FN + right arrow key. if this does not work, you can try to remove and reconnect the LCD cable to the motherboard. If all else fails, proceed to get an LCD replacement either through warranty if available, or by ordering a new LCD.
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