cannot turn on iphone
My phone suddenly powered off and now I cannot turn it on tho' I have tried in many ways (by connecting to the iTunes on laptop, pressing and holding Power and Home buttons blabla) . Last night it was being charged up till 65% when I went to bed. Even if it was not connected with the electricity, it would not have run out of battery such fast as being led to this status. And recently I did not download any apps which can do damage to my phone's administration system. No drop, neither on the floor nor into the water. Please help if you have any idea. Thanks in advance :<
Ohh and it is iPhone6s Plus btw
iPhone 6 Plus