computer screen is consistently on off after pressing the power button

I have a laptop 2 year old purchased by the company. the laptop in consistently on off after pressing the power button. No Screen show anything. How to resolve this problem. This incidents occurs when i was studying the SSC JE Answer Key for my competition exam.

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@sumya81 connect an external monitor and tell us what that shows. It is possible that it is only your screen that turns on and off.

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