Please help my Lg g2 D802.On turning on the phone,LG logo appears & then screen goes blank.

1 day after ugrading my phone to lollipop 5.0.2. My phone turned off when battery completely ended.I plugged the charger battery was at 0% (charging) then suddenly electric supply was accidentally cut off. I turned the phone on and Lg logo appeared and screen became blank. This process is repeating continuously when the phone is on charging ( LG logo appears and then screen goes blank again and again). tried different methods like Vol. up + power putton , down + power button. Nothing...

Please help my Lg g2 D802.On turning on the phone,LG logo appears & then screen goes blank.

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