problem

[bruh1234]

i have a sony xperia u i formatted the storage and then it shut down by itself and when i turn it on again it doesnt turn on ccompleitley it shuts down again and keeps turning on and off alone

[Thommo]

Try to perform a system repair

Switch off your phone and unplug from Pc (Hold volume up and power for around 10 seconds)

Start PC Companion and select Support zone then Update my phone/tablet then in Blue Repair my phone/tablet and follow the onscreen instructions - When prompted connect your phone still switched off holding volume down or back button - This should start the repair or reformat process

If you are using Windows 8/8.1 or a 64bit operating system then adjust the settings for PC Companion and run in compatibility mode and chose Windows 7 or XP