G580 Lenovo doesn't switch on !

I received my G580 Lenovo a year ago. It has work fine but now appear a problem and doesn't switch on.
I try to switch it on, lights come on, it makes noises, the webcam light, power light and battery all come on and stay on, but nothing happens, just a black screen.
At the beggining of time when this problem appeared when i tried several times to turn on, sometimes it turn on and the most of cases it doesn't turn on. Now always doesn't switch on.
Please help me

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iOS: Not responding or does not turn on
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