iphone 4 will not turn on

[johnla781]

I have iphone 4 and it won't turn on. so what should i do.

 

[johnla781]

yes, my iphone is in recovery mode.

 

[johnla781]

I have also installed new firmware on my iPhone 4 then it won't turn on.

 

[johnla781]

After installation of mew firmware and reboot again my iPhone then it is working for some time and again it turns off automatically.