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Last time when i decided i turn off the phone it lagged a bit and before turning off i saw whole screen covered in random pixels for about 2 seconds. When i tried to turn on the phone again nothing happens. After i hold power button for ~3 secs phone vibrates and i can that proximity sensor is glowing with faint red light and that's all. What can i do?
Connect your phone to a wall charger > press and hold power & volume up for 5 seconds > let it charge for 2 hours or so > after 2 hours repair your phone with SUS
Update Service (SUS)
http://www.sonymobile.com/gb/tools/update-service/
http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe
Bridge (for Mac)
Alternatives on How to backup Xperias