Default [Q] Xperia J Won't Turn On

Hello. Recently the screen on my Xperia J cracked and then the LCD died so I replace it but it still wont show. Try to turn it on, it vibrates and the top led shows a dull blue and nothing on the screen. I tried to reinstall the firmware with the Sony Companion with finished but still nothing. Tried flashtool after that with the same result. If I plug the charger in the led turns green.

Please help.

Thanks