Share your experience!
hello.....
i know i must seem like a pest but i have tried all the methods that seem to be working for others and they are just not working for me!!! 
am i missing out on a vital steph to get my phone back on??
ANY help of ANY form would be greatly appreciated
many thnaks xx
I had the same problem with my Xperia Z few days ago.
connect your xperia to a wall charger > press and hold power & volume up for 5 seconds > leave it charging for 1 hour even if you don't see any sign of charging > after one hour repair the phone with SUS
install SUS > restart your PC > run SUS > follow the steps > connect your phone to the PC > press and hold power & volume up once the phone vibrates release both keys and only press and hold volume down
Don't forget the Kudos
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
http://talk.sonymobile.com/thread/36355
Don't forget the Kudos