Xperia U warning symbol

[ha92]

Hi guys,

Having an issue with an Sony Xperia U. Basically upon starting the phone, the Sony logo appears followed by a yellow triangle for about 20-30 seconds and then the phone switches off. I have attached an image of the issue below. 

[Thommo]

Try performing a system repair using Pc Companion as this will often fix issues - This will factory reset your phone

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

[ha92]

Thanks for the help! Do you know what this symbol means as havent come across it before

[Thommo]

Warning - So it either had a failed update or you or someone with access to your phone messed about with it and maybe tried to modify it