My n5110 doesn't turn on

I have dell n5110 laptop and it was working fine until it turn off suddenly yesterday and I tried to turn it on but it didn't. I try to remove charger and press and hold power button for more than 30 second but it didn't work too

And the charger lamp works fine until I press power button it is blinking and sometimes went off

I forget to tell you that when I try to press power button the lap top lamps work for part of second and turn off again.. Need help

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