Xperia M4 Aqua Blue Screen and the death

Hi every body

I have my sony since two years. Since monday, when I use my sony sometime, there are a sreen blue appears and it's turn off , I don't no why ?

Afters this, I can turn on my sony with the button "power" and button "- sounds".

I have try to repair with pc companion but nothing change.

I hope tere are a solution for my sony.

thanks