mobile

hi.i installed android 5.0.2 via pc companion. after a day when i was charging my phone it suddenly turned off and after trying vol up + power and everything i turned off with hard reset button near sim slot.after that when i connect my phone to PC screen wont turn off,but when i connect it to wall charger it turns off just fine. but when i shut down my phon it starts booting automatically.i cant turn, phone is going to automatically attempt boot.
it jsut shows sony logo, shuts down and again shows sony logo