Why my keyboard's backlight flashing but my screen don't show content?

My keyboard's backlight, power button, and caps lock light are flashing together, and my screen doesn't show anything. This situation has been ongoing for nearly 1 year. What should I do?

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Hi @hevbjq4oyspgeyc

What is the model number of the laptop as shown on the product information label on the bottom of the laptop?

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