Power light is on but the screen is no display. [Closed]

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Hello,
Please help me!!!
My laptop is lenovo thinkpad E440.There has a problem now.
_i pressed the power key the light was turned on.
_but the screen was no display.
_and the power light was turned on when i connected the power cable.
_i don't heard any voice.
What's wrong? Please give me advice.Thank you.

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