Black screen when power on. No booting [Closed]

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Hello,

I'm using windows 7 in lenovo laptop. Whenever I try to pOwer on I couldn't see anything on the screen. I feel like the screen is disconnected or the connection is short somewhere. Can anyone tell me what could be the exact problem because technician at repairing shop is asking me to replace display and some graphic panel.please help me out.
Thanks
John bhat

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