[Q] Hard Bricked phone? [SK17i] topic

So, my phone is just suddenly wouldn't turn on. When power button is pressed, it vibrates and a green LED blinks. The screen turn on but aways black, no logo, nothing. It remains this way ultin I retreat the battery. Flashtool can see the divice, in flashmode and fastboot mode. I've tried flash three different stock roms and even Xperia 2011 Range_FreeXperia_ALL.ftf, no success. Any advices?

Sorry for my bad English, this is the first time I post.