i900 won't turn on

[Guest slater7]

The phone won't turn on and doesn't power up even after a charge.Just before it happend 2-3 days it was like morning I turn on the mobile after charging - battery full but after 6hrs showing battery low - around 10% - soft reset - battery comeback to around 85% - as it should then after 2-3hrs again and it wont show more after soft reset so I charge battery...after 3 days when I connect charger or usb wont show anything - battery is fully charged (checked with my friend ones). I cant power on , not responding on charge.....I dont know what to do...

I tried hard rest....still brick

Any help appreciated.