my sony xperia LT25i is dead.i cannot turn on it.i cannot connect this with pc(computer) in flashmode,cause pc cannot detect is.i cannot flash it.suddenly it happen i turn off my phone and after that i cannot turn on it.battary is good.even i cannot charge it.without battary when i put cable from charger or computer red notification led blinks for 1/2 sec.what is happen to my phone.please help.my phone is rooted.